TY  - CONF
AU  - Koprivica, Ranko
AU  - Gavrilović, Marija
AU  - Veljković, Biljana
AU  - Žugić, Radmila
AU  - Dugalić, Goran
AU  - Mileusnić, Zoran
AU  - Milenković, Bojana
PY  - 2023
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6747
AB  - The work investigated the equipment of tractors, attachments and combines
in a medium-sized family farm. The research was conducted on the registered family
farm "Đurković" in the village of Čestin in the municipality of Knić. The farm cultivates
arable and forage crops for feeding dairy cows and fattening oxen on an area of 44 ha.
In the sowing structure, meadows are the most represented with 20 ha (45.45%),
alfalfa 5 ha (11.36%), silage maize 3 ha (6.83%) and perko 0.4 ha (0.91%). The farm
also grows barley on 2 ha, wheat on 1.5 ha, soybeans on 0.7 ha, oats on 0.4 ha, and
peppers for processing on 40 ares. The production process is carried out with three
tractors, 22 implements, a self-propelled combine for small grains and a combine for
silage. One tractor with an average engine power of 41.4 kV works 14.67 ha of
available land with 7.33 attachments. The total available power of the tractor engine is
129.43 kW, and the energy equipment of the farm is 2.94 kW/ha, which is the average
of family farms in Serbia. If the combine engine power for small grain and silage were
added, the energy equipment would increase to 7.85 kV/ha. Combines are underutilized
because they are used only for subsistence. The average age of mechanization is over
40 years, so replacement and purchase of new agricultural machinery is not possible.
PB  - University of Belgrade, Faculty of Agriculture, Serbia
C3  - The 6rd International Symposium on Agricultural Engineering, ISAE-2023, 19-21 October, Belgrade Serbia,
T1  - Technical equipment with mechanization on medium-sized family farms
EP  - 153
SP  - 144
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_6747
ER  - 

@conference{
author = "Koprivica, Ranko and Gavrilović, Marija and Veljković, Biljana and Žugić, Radmila and Dugalić, Goran and Mileusnić, Zoran and Milenković, Bojana",
year = "2023",
abstract = "The work investigated the equipment of tractors, attachments and combines
in a medium-sized family farm. The research was conducted on the registered family
farm "Đurković" in the village of Čestin in the municipality of Knić. The farm cultivates
arable and forage crops for feeding dairy cows and fattening oxen on an area of 44 ha.
In the sowing structure, meadows are the most represented with 20 ha (45.45%),
alfalfa 5 ha (11.36%), silage maize 3 ha (6.83%) and perko 0.4 ha (0.91%). The farm
also grows barley on 2 ha, wheat on 1.5 ha, soybeans on 0.7 ha, oats on 0.4 ha, and
peppers for processing on 40 ares. The production process is carried out with three
tractors, 22 implements, a self-propelled combine for small grains and a combine for
silage. One tractor with an average engine power of 41.4 kV works 14.67 ha of
available land with 7.33 attachments. The total available power of the tractor engine is
129.43 kW, and the energy equipment of the farm is 2.94 kW/ha, which is the average
of family farms in Serbia. If the combine engine power for small grain and silage were
added, the energy equipment would increase to 7.85 kV/ha. Combines are underutilized
because they are used only for subsistence. The average age of mechanization is over
40 years, so replacement and purchase of new agricultural machinery is not possible.",
publisher = "University of Belgrade, Faculty of Agriculture, Serbia",
journal = "The 6rd International Symposium on Agricultural Engineering, ISAE-2023, 19-21 October, Belgrade Serbia,",
title = "Technical equipment with mechanization on medium-sized family farms",
pages = "153-144",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6747"
}

Koprivica, R., Gavrilović, M., Veljković, B., Žugić, R., Dugalić, G., Mileusnić, Z.,& Milenković, B.. (2023). Technical equipment with mechanization on medium-sized family farms. in The 6rd International Symposium on Agricultural Engineering, ISAE-2023, 19-21 October, Belgrade Serbia,
University of Belgrade, Faculty of Agriculture, Serbia., 144-153.
https://hdl.handle.net/21.15107/rcub_agrospace_6747

Koprivica R, Gavrilović M, Veljković B, Žugić R, Dugalić G, Mileusnić Z, Milenković B. Technical equipment with mechanization on medium-sized family farms. in The 6rd International Symposium on Agricultural Engineering, ISAE-2023, 19-21 October, Belgrade Serbia,. 2023;:144-153.
https://hdl.handle.net/21.15107/rcub_agrospace_6747 .

Koprivica, Ranko, Gavrilović, Marija, Veljković, Biljana, Žugić, Radmila, Dugalić, Goran, Mileusnić, Zoran, Milenković, Bojana, "Technical equipment with mechanization on medium-sized family farms" in The 6rd International Symposium on Agricultural Engineering, ISAE-2023, 19-21 October, Belgrade Serbia, (2023):144-153,
https://hdl.handle.net/21.15107/rcub_agrospace_6747 .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Radivojević, D.
AU  - Dedić, T.
AU  - Mileusnić, Zoran
AU  - Djokić, Dragoslav
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5420
AB  - The paper presents the results of testing equipment at family farms with agricultural machinery in Northwest Montenegro in municipalities Pljevlja, Žabljak, Kolašin and Mojkovac. In the mentioned municipalities, 123 agricultural farms in 65 villages were surveyed. The total area of available land on farms is 1612.08 ha, of which only 8.27% are cultivated and the rest meadows and pastures. The average area of family farms is 13.11 ha of used agricultural land, which is three times more than the average in Montenegro. Single-axle tractors with an engine power of 5-10 kW are represented by 16% of the total number of tractors. Family farms are not sufficiently equipped with two-axle tractors, because every other one has a tractor (0.51 tractors per farm). The tractors are average power of 30.12 kW. Energy equipments in the surveyed area, expressed through the nominal engine power of two-axle tractors per unit area, in averages at 1.18 kW / ha. There’s a shortage of tractors with engine power over 50 kW with rear and front wheel drive (double traction). Family farms are insufficiently equipped with attached machines (1.28 machines / farm). Ratios per one two-axle tractor are 2.49 attachments and 10.27 ha of used land. There is a lack of machines for vertical tillage and combined machines for pre-sowing soil preparation (chisel plows, seed drills, rotary harrows), as well a seeder for small grains and corn. In addition, there is a lack of machines for the preparation of silage and haylage in silage facilities (self-loading trailers and combines), as well roll presses, wrappers and catchers wrapped in foil.
PB  - University of Montenegro
T2  - Agriculture and Forestry
T1  - Equipment of family farms with agricultural mechanization in northwest of montenegro
EP  - 239
IS  - 3
SP  - 231
VL  - 66
DO  - 10.17707/AgricultForest.66.3.19
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Radivojević, D. and Dedić, T. and Mileusnić, Zoran and Djokić, Dragoslav",
year = "2020",
abstract = "The paper presents the results of testing equipment at family farms with agricultural machinery in Northwest Montenegro in municipalities Pljevlja, Žabljak, Kolašin and Mojkovac. In the mentioned municipalities, 123 agricultural farms in 65 villages were surveyed. The total area of available land on farms is 1612.08 ha, of which only 8.27% are cultivated and the rest meadows and pastures. The average area of family farms is 13.11 ha of used agricultural land, which is three times more than the average in Montenegro. Single-axle tractors with an engine power of 5-10 kW are represented by 16% of the total number of tractors. Family farms are not sufficiently equipped with two-axle tractors, because every other one has a tractor (0.51 tractors per farm). The tractors are average power of 30.12 kW. Energy equipments in the surveyed area, expressed through the nominal engine power of two-axle tractors per unit area, in averages at 1.18 kW / ha. There’s a shortage of tractors with engine power over 50 kW with rear and front wheel drive (double traction). Family farms are insufficiently equipped with attached machines (1.28 machines / farm). Ratios per one two-axle tractor are 2.49 attachments and 10.27 ha of used land. There is a lack of machines for vertical tillage and combined machines for pre-sowing soil preparation (chisel plows, seed drills, rotary harrows), as well a seeder for small grains and corn. In addition, there is a lack of machines for the preparation of silage and haylage in silage facilities (self-loading trailers and combines), as well roll presses, wrappers and catchers wrapped in foil.",
publisher = "University of Montenegro",
journal = "Agriculture and Forestry",
title = "Equipment of family farms with agricultural mechanization in northwest of montenegro",
pages = "239-231",
number = "3",
volume = "66",
doi = "10.17707/AgricultForest.66.3.19"
}

Koprivica, R., Veljković, B., Radivojević, D., Dedić, T., Mileusnić, Z.,& Djokić, D.. (2020). Equipment of family farms with agricultural mechanization in northwest of montenegro. in Agriculture and Forestry
University of Montenegro., 66(3), 231-239.
https://doi.org/10.17707/AgricultForest.66.3.19

Koprivica R, Veljković B, Radivojević D, Dedić T, Mileusnić Z, Djokić D. Equipment of family farms with agricultural mechanization in northwest of montenegro. in Agriculture and Forestry. 2020;66(3):231-239.
doi:10.17707/AgricultForest.66.3.19 .

Koprivica, Ranko, Veljković, Biljana, Radivojević, D., Dedić, T., Mileusnić, Zoran, Djokić, Dragoslav, "Equipment of family farms with agricultural mechanization in northwest of montenegro" in Agriculture and Forestry, 66, no. 3 (2020):231-239,
https://doi.org/10.17707/AgricultForest.66.3.19 . .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Radivojević, Dušan
AU  - Dedić, Tatjana
AU  - Mileusnić, Zoran
AU  - Terzić, Dragan
AU  - Babović-Djordjević, Maja
AU  - Djokić, Dragoslav
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5476
AB  - The article presents the results of monitored operation of combines during the first season of their joint use for silage preparation in the northern part of Montenegro in machinery rings in the municipalities of Bijelo Polje, Berane and Pljevlja. The seasonal performance was determined for a total of 6 combines, of which only one was used for the preparation of silage from whole corn plants, one combine was used for preparing silage from cuts, and four combines were intended for direct mowing and ensiling of grass. The research included 7 machinery rings and 45 farmers, of which 11 (24.44%) shared harvesters for the preparation of silage from grass, alfalfa, a mixture of legumes, and grain. During the season, the shared harvesters worked 45 days and achieved an output of 23.95 ha and 687.75 t of silage. For the preparation of silage from whole corn plants in 2 machinery rings, a joint combine was used by 9 farmers. The total seasonal performance of the combine was 14.9 ha of harvested land, and 468.45 t of corn silage for 19 days of work. The extent of use of shared silage combine harvesters depends on plot size, area under fodder plants, organization of work, output of the combine, optimal dates for cultural operations, and weather conditions i.e. the number of days suitable for work, etc.
AB  - U radu su prikazani rezultati praćenja rada kombajna u toku prve sezone zajedničkog korišćenja u pripremanju silaže u Severnom delu Crne Gore u mašinskim prstenovima u opštinama Bijelo Polje, Berane i Pljevlja. Utvrđen je sezonski učinak ukupno 6 kombajna, od kojih je samo jedan za pripremanje silaže od cele biljke kukuruza, jedan kombajn je za siliranje silomase iz otkosa, a četiri kombajna su namenjena za direktno košenje i siliranje trava. Istraživanjima je obuhvaćeno 7 mašinskih prstenova i 45 farmera, od kojih je 11 (24,44%) zajednički koristilo kombajne za pripremu silaže od trava, lucerke, mešavine leguminoza i žita. U toku sezone zajednički korišćeni kombajni su radili 45 dana i ostvarili učinak od 23,95 ha i 687,75 t silo mase. Za pripremu silaže od cele biljke kukuruza u 2 mašinska prstena zajednički kombajn je koristilo 9 farmera. Ukupan sezonski površinski učinak kombajna je 14,9 ha, a maseni 468,45 t silaže kukuruza za 19 dana rada. Obim korišćenja zajedničkih kombajna za silažu zavisi od veličine parcele, površina pod krmnim biljem, organizacije rada, eksploatacionog učinka kombajna, optimalnih agrotehničkih rokova, vremenskih uslova, odnosno broja pogodnih dana za rad i dr.
PB  - Univerzitet u Kragujevcu - Agronomski fakultet, Čačak
T2  - Acta agriculturae Serbica
T1  - Seasonal performance of shared silage combine harvesters in a machinery ring
EP  - 94
IS  - 49
SP  - 89
VL  - 25
DO  - 10.5937/AASer2049089K
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Radivojević, Dušan and Dedić, Tatjana and Mileusnić, Zoran and Terzić, Dragan and Babović-Djordjević, Maja and Djokić, Dragoslav",
year = "2020",
abstract = "The article presents the results of monitored operation of combines during the first season of their joint use for silage preparation in the northern part of Montenegro in machinery rings in the municipalities of Bijelo Polje, Berane and Pljevlja. The seasonal performance was determined for a total of 6 combines, of which only one was used for the preparation of silage from whole corn plants, one combine was used for preparing silage from cuts, and four combines were intended for direct mowing and ensiling of grass. The research included 7 machinery rings and 45 farmers, of which 11 (24.44%) shared harvesters for the preparation of silage from grass, alfalfa, a mixture of legumes, and grain. During the season, the shared harvesters worked 45 days and achieved an output of 23.95 ha and 687.75 t of silage. For the preparation of silage from whole corn plants in 2 machinery rings, a joint combine was used by 9 farmers. The total seasonal performance of the combine was 14.9 ha of harvested land, and 468.45 t of corn silage for 19 days of work. The extent of use of shared silage combine harvesters depends on plot size, area under fodder plants, organization of work, output of the combine, optimal dates for cultural operations, and weather conditions i.e. the number of days suitable for work, etc., U radu su prikazani rezultati praćenja rada kombajna u toku prve sezone zajedničkog korišćenja u pripremanju silaže u Severnom delu Crne Gore u mašinskim prstenovima u opštinama Bijelo Polje, Berane i Pljevlja. Utvrđen je sezonski učinak ukupno 6 kombajna, od kojih je samo jedan za pripremanje silaže od cele biljke kukuruza, jedan kombajn je za siliranje silomase iz otkosa, a četiri kombajna su namenjena za direktno košenje i siliranje trava. Istraživanjima je obuhvaćeno 7 mašinskih prstenova i 45 farmera, od kojih je 11 (24,44%) zajednički koristilo kombajne za pripremu silaže od trava, lucerke, mešavine leguminoza i žita. U toku sezone zajednički korišćeni kombajni su radili 45 dana i ostvarili učinak od 23,95 ha i 687,75 t silo mase. Za pripremu silaže od cele biljke kukuruza u 2 mašinska prstena zajednički kombajn je koristilo 9 farmera. Ukupan sezonski površinski učinak kombajna je 14,9 ha, a maseni 468,45 t silaže kukuruza za 19 dana rada. Obim korišćenja zajedničkih kombajna za silažu zavisi od veličine parcele, površina pod krmnim biljem, organizacije rada, eksploatacionog učinka kombajna, optimalnih agrotehničkih rokova, vremenskih uslova, odnosno broja pogodnih dana za rad i dr.",
publisher = "Univerzitet u Kragujevcu - Agronomski fakultet, Čačak",
journal = "Acta agriculturae Serbica",
title = "Seasonal performance of shared silage combine harvesters in a machinery ring",
pages = "94-89",
number = "49",
volume = "25",
doi = "10.5937/AASer2049089K"
}

Koprivica, R., Veljković, B., Radivojević, D., Dedić, T., Mileusnić, Z., Terzić, D., Babović-Djordjević, M.,& Djokić, D.. (2020). Seasonal performance of shared silage combine harvesters in a machinery ring. in Acta agriculturae Serbica
Univerzitet u Kragujevcu - Agronomski fakultet, Čačak., 25(49), 89-94.
https://doi.org/10.5937/AASer2049089K

Koprivica R, Veljković B, Radivojević D, Dedić T, Mileusnić Z, Terzić D, Babović-Djordjević M, Djokić D. Seasonal performance of shared silage combine harvesters in a machinery ring. in Acta agriculturae Serbica. 2020;25(49):89-94.
doi:10.5937/AASer2049089K .

Koprivica, Ranko, Veljković, Biljana, Radivojević, Dušan, Dedić, Tatjana, Mileusnić, Zoran, Terzić, Dragan, Babović-Djordjević, Maja, Djokić, Dragoslav, "Seasonal performance of shared silage combine harvesters in a machinery ring" in Acta agriculturae Serbica, 25, no. 49 (2020):89-94,
https://doi.org/10.5937/AASer2049089K . .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Turan, Jan
AU  - Radivojević, Dušan
AU  - Ćurčić, Srećko
AU  - Mileusnić, Zoran
AU  - Balalić, Igor
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5146
AB  - Knowing the coefficient of friction of bio material is important in determining the angle of the grain elevator elevator when designing combines, as well as the angles of gravity tables and pipes in seed finishing. The basic characteristic of biological materials, or seeds of agricultural crops, is that they differ in their physical and morphological characteristics. Therefore, the friction depends on: the types of plants, variety, shape, dimensions and seed content, the humidity of the seed, the intensity of the normal force on the substrate and the roughness of the substrate. The paper presents the results of the study of the influence of individual factors (varieties, water content of the grain and the type of substrate) and their interactions on the grain friction coefficient. The domestic varieties that are grown in Serbia are selected for testing the fruiting grain fruity: Banadanka, Jasna and Slavica. The experimental measurement of the static coefficient of grain slip friction was done using the level of the mechanical device Tribometr. Plastic, plywood, galvanized, steel, aluminum and stainless steel sheet are made for the experiment purposes. Research was carried out with different water content in grains: 6%, 11%, 16% and 24%. The variety Banadanka had a lower friction coefficient compared to Jasna and Slavica varieties on all substrates and with all the water content of the grain. It was found that with the increase of water content in the grain, a significant increase in the friction coefficient of the grains of the tested varieties on all substrates was achieved. The highest friction coefficient for all water content of the grains of the tested varieties was on the base of the plywood board, and the smallest on the base of stainless steel sheet.
T2  - 16th International Conference on Tribology
T1  - Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface
EP  - 525
IS  - 1
SP  - 518
VL  - 1
DO  - 10.24874/PES01.01.068
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Turan, Jan and Radivojević, Dušan and Ćurčić, Srećko and Mileusnić, Zoran and Balalić, Igor",
year = "2019",
abstract = "Knowing the coefficient of friction of bio material is important in determining the angle of the grain elevator elevator when designing combines, as well as the angles of gravity tables and pipes in seed finishing. The basic characteristic of biological materials, or seeds of agricultural crops, is that they differ in their physical and morphological characteristics. Therefore, the friction depends on: the types of plants, variety, shape, dimensions and seed content, the humidity of the seed, the intensity of the normal force on the substrate and the roughness of the substrate. The paper presents the results of the study of the influence of individual factors (varieties, water content of the grain and the type of substrate) and their interactions on the grain friction coefficient. The domestic varieties that are grown in Serbia are selected for testing the fruiting grain fruity: Banadanka, Jasna and Slavica. The experimental measurement of the static coefficient of grain slip friction was done using the level of the mechanical device Tribometr. Plastic, plywood, galvanized, steel, aluminum and stainless steel sheet are made for the experiment purposes. Research was carried out with different water content in grains: 6%, 11%, 16% and 24%. The variety Banadanka had a lower friction coefficient compared to Jasna and Slavica varieties on all substrates and with all the water content of the grain. It was found that with the increase of water content in the grain, a significant increase in the friction coefficient of the grains of the tested varieties on all substrates was achieved. The highest friction coefficient for all water content of the grains of the tested varieties was on the base of the plywood board, and the smallest on the base of stainless steel sheet.",
journal = "16th International Conference on Tribology",
title = "Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface",
pages = "525-518",
number = "1",
volume = "1",
doi = "10.24874/PES01.01.068"
}

Koprivica, R., Veljković, B., Turan, J., Radivojević, D., Ćurčić, S., Mileusnić, Z.,& Balalić, I.. (2019). Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface. in 16th International Conference on Tribology, 1(1), 518-525.
https://doi.org/10.24874/PES01.01.068

Koprivica R, Veljković B, Turan J, Radivojević D, Ćurčić S, Mileusnić Z, Balalić I. Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface. in 16th International Conference on Tribology. 2019;1(1):518-525.
doi:10.24874/PES01.01.068 .

Koprivica, Ranko, Veljković, Biljana, Turan, Jan, Radivojević, Dušan, Ćurčić, Srećko, Mileusnić, Zoran, Balalić, Igor, "Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface" in 16th International Conference on Tribology, 1, no. 1 (2019):518-525,
https://doi.org/10.24874/PES01.01.068 . .

TY  - CONF
AU  - Koprivica, Ranko
AU  - Dekić, Vera
AU  - Veljković, Biljana
AU  - Terzić, Dragan
AU  - Dokić, Dragoslav
AU  - Mileusnić, Zoran
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5096
AB  - By executing appropriate agro-technical measures in the process of production of field crops (wheat), due to the numerous passages by machines, the soil gets compacted. In the family farms in Serbia, technological processes of production of field crops comprise specific agro-technical measures, starting with distribution of fertilizers, a multi-phase soil treatment system, followed by sowing, protecting, fertilization, harvesting, transporting of grain and plant residues. Thus, in the implementation of technological operations in the production of plant crops, the land area of the plot is exposed to 10 to 15 passages by tractor and self-propelled systems. A large number of passages by machines result in the soil compaction in the centre of the plot, and especially on the edges - headlands, which negatively affects the yield of cultivated crops and leads to physical and mechanical disturbance of the structure of the soil. The aim of the research was to determine the difference in yield, plant height, spike length, 1000 grain weight and volume grain wheat in the central part of the plot in relation to the headlands of the plot. For the purpose of this paper, a trial was set up with varieties of wheat Pobeda at three sites, and the wheat yield was measured on the inner part - plot centre and the edges - headlands of the plot, with more pronounced soil compaction. During the research, in addition to the yield, the following were determined: the difference in plant height, spike length, 1000 grain weight and volume (hectolitre) grain weight in the middle plot and headlands. The yield of wheat on the inner part of the plot at all locations was above 44% to 69.06% to yield realized on the headlands. The average plant height was higher by 4.76% to 13.75%, and the spike length from 6.11% to 15.93% in the middle of the plot relative to the edges - headlands. On the inner part of the plot the weight of 1000 grains and volume weight were lower compared to the values of these properties on the edges.
PB  - Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb
C3  - Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering
T1  - The decrease of wheat yield on the plot edges - headlands due to soil compaction
EP  - 106
SP  - 97
VL  - 47
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5096
ER  - 

@conference{
author = "Koprivica, Ranko and Dekić, Vera and Veljković, Biljana and Terzić, Dragan and Dokić, Dragoslav and Mileusnić, Zoran",
year = "2019",
abstract = "By executing appropriate agro-technical measures in the process of production of field crops (wheat), due to the numerous passages by machines, the soil gets compacted. In the family farms in Serbia, technological processes of production of field crops comprise specific agro-technical measures, starting with distribution of fertilizers, a multi-phase soil treatment system, followed by sowing, protecting, fertilization, harvesting, transporting of grain and plant residues. Thus, in the implementation of technological operations in the production of plant crops, the land area of the plot is exposed to 10 to 15 passages by tractor and self-propelled systems. A large number of passages by machines result in the soil compaction in the centre of the plot, and especially on the edges - headlands, which negatively affects the yield of cultivated crops and leads to physical and mechanical disturbance of the structure of the soil. The aim of the research was to determine the difference in yield, plant height, spike length, 1000 grain weight and volume grain wheat in the central part of the plot in relation to the headlands of the plot. For the purpose of this paper, a trial was set up with varieties of wheat Pobeda at three sites, and the wheat yield was measured on the inner part - plot centre and the edges - headlands of the plot, with more pronounced soil compaction. During the research, in addition to the yield, the following were determined: the difference in plant height, spike length, 1000 grain weight and volume (hectolitre) grain weight in the middle plot and headlands. The yield of wheat on the inner part of the plot at all locations was above 44% to 69.06% to yield realized on the headlands. The average plant height was higher by 4.76% to 13.75%, and the spike length from 6.11% to 15.93% in the middle of the plot relative to the edges - headlands. On the inner part of the plot the weight of 1000 grains and volume weight were lower compared to the values of these properties on the edges.",
publisher = "Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb",
journal = "Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering",
title = "The decrease of wheat yield on the plot edges - headlands due to soil compaction",
pages = "106-97",
volume = "47",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5096"
}

Koprivica, R., Dekić, V., Veljković, B., Terzić, D., Dokić, D.,& Mileusnić, Z.. (2019). The decrease of wheat yield on the plot edges - headlands due to soil compaction. in Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering
Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb., 47, 97-106.
https://hdl.handle.net/21.15107/rcub_agrospace_5096

Koprivica R, Dekić V, Veljković B, Terzić D, Dokić D, Mileusnić Z. The decrease of wheat yield on the plot edges - headlands due to soil compaction. in Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering. 2019;47:97-106.
https://hdl.handle.net/21.15107/rcub_agrospace_5096 .

Koprivica, Ranko, Dekić, Vera, Veljković, Biljana, Terzić, Dragan, Dokić, Dragoslav, Mileusnić, Zoran, "The decrease of wheat yield on the plot edges - headlands due to soil compaction" in Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering, 47 (2019):97-106,
https://hdl.handle.net/21.15107/rcub_agrospace_5096 .

TY  - CONF
AU  - Koprivica, Ranko
AU  - Turan, Jan
AU  - Veljković, Biljana
AU  - Radivojević, Dušan
AU  - Bokan, Nikola
AU  - Durović, Dragan
AU  - Dokić, Dragoslav
AU  - Balalić, Igor
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4707
AB  - The physical properties of the three common cultivars were evaluated as a function of seed moisture content, which varied from 6.04 - 21.17%, from 5.82 - 20.90% and from 5.98 - 20.46% in 'Banacanka', 'Jasna' and 'Slavica', respectively. Results of thousand-seed weight increased from 4.18 g to 4.94 g in 'Banacanka', from 4.74 g to 5.61 g in 'Jasna', and from 4.11 to 4.81 g in 'Slavica'. The seed volume of 'Jasna' ranged between 4.72 mm(3) and 5.49 mm(3), and it was significantly higher than that of 'Banacanka' and 'Slavica' (4.07 - 4.93 mm(3) and 4.12 - 4.81 mm(3), respectively). The bulk density of 'Jasna' seeds was significantly lower than in other cultivars. Depending on seed moisture content, seed density decreased from 1023.18 kgm(-3) to 996.97 kgm(-3) in 'Banacanka', from 1009.31 to 992.70 kgm(-3) in 'Jasna', and from 1012.96-992 kgm(-3) in 'Slavica'. Porosity increased with increasing seed moisture content in all cultivars. The porosity of 'Jasna' seeds (35.97-38.43%) was higher than that of 'Banacanka' (35.42-38.23%) and 'Slavica' (35.19-37.07%) seeds. At different seed moisture levels, bulk density varied from 665.82 to 615.84 kgm(-3) in 'Banacanka', from 646.24 to 611.22 kgm(-3) in 'Jasna', and from 656.57 to 624.66 kgm(-3) in 'Slavica'. The static angle of repose in 'Banacanka', 'Jasna' and 'Slavica' ranged from 22.96 degrees to 28.05 degrees, from 24.64 degrees to 29.66 degrees and from 24.63 degrees to 29.61 degrees at moisture contents increasing. The dynamic angle of repose was highest in 'Jasna' (20.32-25.90 degrees), followed by 'Slavica' (21.03-25.58 degrees), and lowest in 'Banacanka' (19.22-24.66 degrees). Increasing seed moisture content was found to increase the friction coefficient. The static friction coefficient of cvs. 'Jasna' and 'Slavica' was higher than for 'Banacanka'.
PB  - Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb
C3  - Actual Tasks on Agricultural Engineering
T1  - Physical properties of oil rapeseed kernels at different moisture content and varietes
EP  - 405
SP  - 397
VL  - 46
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_4707
ER  - 

@conference{
author = "Koprivica, Ranko and Turan, Jan and Veljković, Biljana and Radivojević, Dušan and Bokan, Nikola and Durović, Dragan and Dokić, Dragoslav and Balalić, Igor",
year = "2018",
abstract = "The physical properties of the three common cultivars were evaluated as a function of seed moisture content, which varied from 6.04 - 21.17%, from 5.82 - 20.90% and from 5.98 - 20.46% in 'Banacanka', 'Jasna' and 'Slavica', respectively. Results of thousand-seed weight increased from 4.18 g to 4.94 g in 'Banacanka', from 4.74 g to 5.61 g in 'Jasna', and from 4.11 to 4.81 g in 'Slavica'. The seed volume of 'Jasna' ranged between 4.72 mm(3) and 5.49 mm(3), and it was significantly higher than that of 'Banacanka' and 'Slavica' (4.07 - 4.93 mm(3) and 4.12 - 4.81 mm(3), respectively). The bulk density of 'Jasna' seeds was significantly lower than in other cultivars. Depending on seed moisture content, seed density decreased from 1023.18 kgm(-3) to 996.97 kgm(-3) in 'Banacanka', from 1009.31 to 992.70 kgm(-3) in 'Jasna', and from 1012.96-992 kgm(-3) in 'Slavica'. Porosity increased with increasing seed moisture content in all cultivars. The porosity of 'Jasna' seeds (35.97-38.43%) was higher than that of 'Banacanka' (35.42-38.23%) and 'Slavica' (35.19-37.07%) seeds. At different seed moisture levels, bulk density varied from 665.82 to 615.84 kgm(-3) in 'Banacanka', from 646.24 to 611.22 kgm(-3) in 'Jasna', and from 656.57 to 624.66 kgm(-3) in 'Slavica'. The static angle of repose in 'Banacanka', 'Jasna' and 'Slavica' ranged from 22.96 degrees to 28.05 degrees, from 24.64 degrees to 29.66 degrees and from 24.63 degrees to 29.61 degrees at moisture contents increasing. The dynamic angle of repose was highest in 'Jasna' (20.32-25.90 degrees), followed by 'Slavica' (21.03-25.58 degrees), and lowest in 'Banacanka' (19.22-24.66 degrees). Increasing seed moisture content was found to increase the friction coefficient. The static friction coefficient of cvs. 'Jasna' and 'Slavica' was higher than for 'Banacanka'.",
publisher = "Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb",
journal = "Actual Tasks on Agricultural Engineering",
title = "Physical properties of oil rapeseed kernels at different moisture content and varietes",
pages = "405-397",
volume = "46",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_4707"
}

Koprivica, R., Turan, J., Veljković, B., Radivojević, D., Bokan, N., Durović, D., Dokić, D.,& Balalić, I.. (2018). Physical properties of oil rapeseed kernels at different moisture content and varietes. in Actual Tasks on Agricultural Engineering
Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb., 46, 397-405.
https://hdl.handle.net/21.15107/rcub_agrospace_4707

Koprivica R, Turan J, Veljković B, Radivojević D, Bokan N, Durović D, Dokić D, Balalić I. Physical properties of oil rapeseed kernels at different moisture content and varietes. in Actual Tasks on Agricultural Engineering. 2018;46:397-405.
https://hdl.handle.net/21.15107/rcub_agrospace_4707 .

Koprivica, Ranko, Turan, Jan, Veljković, Biljana, Radivojević, Dušan, Bokan, Nikola, Durović, Dragan, Dokić, Dragoslav, Balalić, Igor, "Physical properties of oil rapeseed kernels at different moisture content and varietes" in Actual Tasks on Agricultural Engineering, 46 (2018):397-405,
https://hdl.handle.net/21.15107/rcub_agrospace_4707 .

TY  - JOUR
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Mileusnić, Zoran
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4657
AB  - Milk production in Serbia is characterized by small surface of production and a large number of small family farms. For rural areas where this production is mostly carried out, economic profitability of production contributes to becoming a family business. This study refers to milk family farms of smaller and medium economic and production capacity, for which the economic analysis in the period of three years was applied and production results were calculated. Applying the calculation method the total revenues and total costs, and contribution margins per cow and per liter of produced milk were computed. By comparing the results obtained on farms A and B, conclusions were drawn, and the sensitivity of contribution margins to change of the given parameters (purchase prices of milk and milk produced per cow) was determined by sensitivity analysis. The stability in production is realized by achieving higher contribution margins with satisfactory milk yield per cow and quality milk, as well acceptable purchase prices of milk.
PB  - Univ Zagreb, Fac Agriculture, Zagreb
T2  - Journal of Central European Agriculture
T1  - Sensitivity of contribution margin in milk production on family farms
EP  - 677
IS  - 3
SP  - 658
VL  - 19
DO  - 10.5513/JCEA01/19.3.2095
ER  - 

@article{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, Dušan and Mileusnić, Zoran",
year = "2018",
abstract = "Milk production in Serbia is characterized by small surface of production and a large number of small family farms. For rural areas where this production is mostly carried out, economic profitability of production contributes to becoming a family business. This study refers to milk family farms of smaller and medium economic and production capacity, for which the economic analysis in the period of three years was applied and production results were calculated. Applying the calculation method the total revenues and total costs, and contribution margins per cow and per liter of produced milk were computed. By comparing the results obtained on farms A and B, conclusions were drawn, and the sensitivity of contribution margins to change of the given parameters (purchase prices of milk and milk produced per cow) was determined by sensitivity analysis. The stability in production is realized by achieving higher contribution margins with satisfactory milk yield per cow and quality milk, as well acceptable purchase prices of milk.",
publisher = "Univ Zagreb, Fac Agriculture, Zagreb",
journal = "Journal of Central European Agriculture",
title = "Sensitivity of contribution margin in milk production on family farms",
pages = "677-658",
number = "3",
volume = "19",
doi = "10.5513/JCEA01/19.3.2095"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Mileusnić, Z.. (2018). Sensitivity of contribution margin in milk production on family farms. in Journal of Central European Agriculture
Univ Zagreb, Fac Agriculture, Zagreb., 19(3), 658-677.
https://doi.org/10.5513/JCEA01/19.3.2095

Veljković B, Koprivica R, Radivojević D, Mileusnić Z. Sensitivity of contribution margin in milk production on family farms. in Journal of Central European Agriculture. 2018;19(3):658-677.
doi:10.5513/JCEA01/19.3.2095 .

Veljković, Biljana, Koprivica, Ranko, Radivojević, Dušan, Mileusnić, Zoran, "Sensitivity of contribution margin in milk production on family farms" in Journal of Central European Agriculture, 19, no. 3 (2018):658-677,
https://doi.org/10.5513/JCEA01/19.3.2095 . .

TY  - JOUR
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Mileusnić, Zoran
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4878
AB  - The structure of the milk supply market depends on processing capacities in Serbia, which are more oriented to the production of dairy products pasteurized and sterilized milk and fermented dairy products (yoghurt, cream, sour milk, etc.), while the production of solid dairy products (cheeses, cream, spreads, butter, powdered milk, etc.) is significantly lower. Taking into consideration the current situation in Serbia regarding the primary production, purchase and processing of milk, an overview is given of the foreign trade balance of milk and dairy products and their participation in exports and imports. The analysis of the foreign trade of milk and dairy products for the period 2007- 2017 highlights products that are exported and have stable export tendencies, as well as scarce products which are imported and have a markedly negative balance sheet in the observed period. We also analyzed major export-import destinations of Serbia for the trade exchange of milk and dairy products, which primarily refers to the CEFTA countries, the European Union and the Russian Federation.
AB  - Struktura tržišne ponude mleka zavisi od preradnih kapaciteta u Srbiji, koji su više orijentisani na proizvodnju mlečnih proizvoda pasterizovanog i sterilizovanog mleka i fermentisanih mlečnih proizvoda (jogurt, pavlaka, kiselo mleko itd.) dok je proizvodnja čvrstih mlečnih proizvoda (sirevi, pavlake, namazi, maslac, mleko u prahu itd.) značajno manja. Uzimajući u obzir aktuelno stanje u Srbiji u primarnoj proizvodnji, otkupu i preradi mleka, dat je kratak osvrt na spoljnotrgovinski bilans mleka i mlečnih proizvoda i njihovo učešće u izvozu i uvozu. Analizom spoljnotrgovinske razmene mleka i proizvoda za posmatrani period 2007-2017. godine ukazano je na proizvode koji se izvoze i imaju stabilne izvozne tendencije, kao i na deficitarne proizvode koji se uvoze i imaju izražene negativne bilanse u posmatranom periodu. Analizirane su i najvažnije izvozno- uvozne destinacije sa kojima Srbija ostvaruje trgovinsku razmenu za mleko i mlečne proizvode, pri čemu se to prvenstveno odnosi na zemlje CEFTA grupe, Evropske unije i Rusku Federaciju.
PB  - Univerzitet u Kragujevcu - Agronomski fakultet, Čačak
T2  - Acta agriculturae Serbica
T1  - Structure of exports and imports of milk and dairy products from Serbia
T1  - Struktura izvoza i uvoza mleka i mlečnih proizvoda iz Srbije
EP  - 211
IS  - 46
SP  - 197
VL  - 23
DO  - 10.5937/AASer1846197V
ER  - 

@article{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, Dušan and Mileusnić, Zoran",
year = "2018",
abstract = "The structure of the milk supply market depends on processing capacities in Serbia, which are more oriented to the production of dairy products pasteurized and sterilized milk and fermented dairy products (yoghurt, cream, sour milk, etc.), while the production of solid dairy products (cheeses, cream, spreads, butter, powdered milk, etc.) is significantly lower. Taking into consideration the current situation in Serbia regarding the primary production, purchase and processing of milk, an overview is given of the foreign trade balance of milk and dairy products and their participation in exports and imports. The analysis of the foreign trade of milk and dairy products for the period 2007- 2017 highlights products that are exported and have stable export tendencies, as well as scarce products which are imported and have a markedly negative balance sheet in the observed period. We also analyzed major export-import destinations of Serbia for the trade exchange of milk and dairy products, which primarily refers to the CEFTA countries, the European Union and the Russian Federation., Struktura tržišne ponude mleka zavisi od preradnih kapaciteta u Srbiji, koji su više orijentisani na proizvodnju mlečnih proizvoda pasterizovanog i sterilizovanog mleka i fermentisanih mlečnih proizvoda (jogurt, pavlaka, kiselo mleko itd.) dok je proizvodnja čvrstih mlečnih proizvoda (sirevi, pavlake, namazi, maslac, mleko u prahu itd.) značajno manja. Uzimajući u obzir aktuelno stanje u Srbiji u primarnoj proizvodnji, otkupu i preradi mleka, dat je kratak osvrt na spoljnotrgovinski bilans mleka i mlečnih proizvoda i njihovo učešće u izvozu i uvozu. Analizom spoljnotrgovinske razmene mleka i proizvoda za posmatrani period 2007-2017. godine ukazano je na proizvode koji se izvoze i imaju stabilne izvozne tendencije, kao i na deficitarne proizvode koji se uvoze i imaju izražene negativne bilanse u posmatranom periodu. Analizirane su i najvažnije izvozno- uvozne destinacije sa kojima Srbija ostvaruje trgovinsku razmenu za mleko i mlečne proizvode, pri čemu se to prvenstveno odnosi na zemlje CEFTA grupe, Evropske unije i Rusku Federaciju.",
publisher = "Univerzitet u Kragujevcu - Agronomski fakultet, Čačak",
journal = "Acta agriculturae Serbica",
title = "Structure of exports and imports of milk and dairy products from Serbia, Struktura izvoza i uvoza mleka i mlečnih proizvoda iz Srbije",
pages = "211-197",
number = "46",
volume = "23",
doi = "10.5937/AASer1846197V"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Mileusnić, Z.. (2018). Structure of exports and imports of milk and dairy products from Serbia. in Acta agriculturae Serbica
Univerzitet u Kragujevcu - Agronomski fakultet, Čačak., 23(46), 197-211.
https://doi.org/10.5937/AASer1846197V

Veljković B, Koprivica R, Radivojević D, Mileusnić Z. Structure of exports and imports of milk and dairy products from Serbia. in Acta agriculturae Serbica. 2018;23(46):197-211.
doi:10.5937/AASer1846197V .

Veljković, Biljana, Koprivica, Ranko, Radivojević, Dušan, Mileusnić, Zoran, "Structure of exports and imports of milk and dairy products from Serbia" in Acta agriculturae Serbica, 23, no. 46 (2018):197-211,
https://doi.org/10.5937/AASer1846197V . .

TY  - CONF
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Broćić, Zoran
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5651
AB  - Ensuring high yields of good-quality corn silage provides cheaper rations for milking cows. To reduce silage production costs, the calculation method was used for the analysis of milk production on two  farms (A and B) during three years. The article presents the breakdown of milk production costs as the average percentage of total variable costs for both farms, as well as the costs of silage.
AB  - Ostvarenjem dobrih prinosa kvalitetne silaže kukuruza obezbeđuju se jeftiniji obroci za ishranu muznih krava. U cilju smanjivanja troškova proizvodnje silaže metodom kalkulacija analizirana je ova proizvodnja na dva poljoprivredna gazdinstva A i B za period od tri godine. U radu je dato prosečno učešće troškova u ukupnim varijabilnim troškovima za oba gazdinstva kao i cene koštanja proizvedene silaže.
C3  - 23. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 09.-10. 03. 2018.
T1  - Calculations in Silage Production
T1  - Kalkulacije u proizvodnji silaže
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5651
ER  - 

@conference{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, Dušan and Broćić, Zoran",
year = "2018",
abstract = "Ensuring high yields of good-quality corn silage provides cheaper rations for milking cows. To reduce silage production costs, the calculation method was used for the analysis of milk production on two  farms (A and B) during three years. The article presents the breakdown of milk production costs as the average percentage of total variable costs for both farms, as well as the costs of silage., Ostvarenjem dobrih prinosa kvalitetne silaže kukuruza obezbeđuju se jeftiniji obroci za ishranu muznih krava. U cilju smanjivanja troškova proizvodnje silaže metodom kalkulacija analizirana je ova proizvodnja na dva poljoprivredna gazdinstva A i B za period od tri godine. U radu je dato prosečno učešće troškova u ukupnim varijabilnim troškovima za oba gazdinstva kao i cene koštanja proizvedene silaže.",
journal = "23. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 09.-10. 03. 2018.",
title = "Calculations in Silage Production, Kalkulacije u proizvodnji silaže",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5651"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Broćić, Z.. (2018). Calculations in Silage Production. in 23. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 09.-10. 03. 2018..
https://hdl.handle.net/21.15107/rcub_agrospace_5651

Veljković B, Koprivica R, Radivojević D, Broćić Z. Calculations in Silage Production. in 23. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 09.-10. 03. 2018.. 2018;.
https://hdl.handle.net/21.15107/rcub_agrospace_5651 .

Veljković, Biljana, Koprivica, Ranko, Radivojević, Dušan, Broćić, Zoran, "Calculations in Silage Production" in 23. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 09.-10. 03. 2018. (2018),
https://hdl.handle.net/21.15107/rcub_agrospace_5651 .

TY  - CONF
AU  - Veljković, Biljana
AU  - Petrović, Milun
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5633
AB  - This article presents the economic analysis of two farms A and B for the period 2013-2015. Based on the data for the three years, the income and value of realized production, variable costs and gross margin were calculated, and values were measured per dairy cow for easier comparison. Efficiency in milk production largely depends on the cost of feeding dairy cows, as well on the selling price of milk. These parameters changed in the research period on both farms and significantly impacted the values of realized gross margin.
AB  - U radu je data ekonomska analiza dva poljoprivredna gazdinstva A i B za period od 2013-2015. godine. Na osnovu praćenih podataka za tri godine izračunati su prihodi i vrednosti ostvarene proizvodnje, varijabilni troškovi i bruto marža, a radi lakše komparacije iskazani su rezultati po muznom grlu. Efikasnost u proizvodnji mleka u velikoj meri zavisi od troškova ishrane muznih krava, kao i prodajne cene mleka, ovi parametri su bili promenljivi u posmatranom periodu na oba gazdinstva i značajno su uticali na ostvarene vrednosti bruto marže.
C3  - 22. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 10.-11. 03. 2017.
T1  - Economic Parameters in Milk Production on Farms
T1  - Ekonomski parametri u proizvodnji mleka na poljoprivrednom gazdinstvu
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5633
ER  - 

@conference{
author = "Veljković, Biljana and Petrović, Milun and Koprivica, Ranko and Radivojević, Dušan",
year = "2017",
abstract = "This article presents the economic analysis of two farms A and B for the period 2013-2015. Based on the data for the three years, the income and value of realized production, variable costs and gross margin were calculated, and values were measured per dairy cow for easier comparison. Efficiency in milk production largely depends on the cost of feeding dairy cows, as well on the selling price of milk. These parameters changed in the research period on both farms and significantly impacted the values of realized gross margin., U radu je data ekonomska analiza dva poljoprivredna gazdinstva A i B za period od 2013-2015. godine. Na osnovu praćenih podataka za tri godine izračunati su prihodi i vrednosti ostvarene proizvodnje, varijabilni troškovi i bruto marža, a radi lakše komparacije iskazani su rezultati po muznom grlu. Efikasnost u proizvodnji mleka u velikoj meri zavisi od troškova ishrane muznih krava, kao i prodajne cene mleka, ovi parametri su bili promenljivi u posmatranom periodu na oba gazdinstva i značajno su uticali na ostvarene vrednosti bruto marže.",
journal = "22. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 10.-11. 03. 2017.",
title = "Economic Parameters in Milk Production on Farms, Ekonomski parametri u proizvodnji mleka na poljoprivrednom gazdinstvu",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5633"
}

Veljković, B., Petrović, M., Koprivica, R.,& Radivojević, D.. (2017). Economic Parameters in Milk Production on Farms. in 22. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 10.-11. 03. 2017..
https://hdl.handle.net/21.15107/rcub_agrospace_5633

Veljković B, Petrović M, Koprivica R, Radivojević D. Economic Parameters in Milk Production on Farms. in 22. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 10.-11. 03. 2017.. 2017;.
https://hdl.handle.net/21.15107/rcub_agrospace_5633 .

Veljković, Biljana, Petrović, Milun, Koprivica, Ranko, Radivojević, Dušan, "Economic Parameters in Milk Production on Farms" in 22. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 10.-11. 03. 2017. (2017),
https://hdl.handle.net/21.15107/rcub_agrospace_5633 .

TY  - JOUR
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, D.
AU  - Mileusnić, Zoran
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4294
AB  - Dairy farms generate large amounts of manure as their by-product. In tie-stall and free-stall housing systems for dairy cows, in barns with a lot of or little bedding used, the solid manure produced is a mixture of dung, urine and bedding. In traditional cattle farming which is mostly practiced on small family farms, the manure generated is mostly solid. The amount of manure available from dairy cattle on an annual basis is substantially dependent on farm production capacity and number and class of cattle. Manure is also affected by housing system, cattle management practices and type of bedding. This study presents the amounts of solid manure obtained on farms of 10, 20 and 50 dairy cows and provides the nutrient content and an estimated value of the manure.
AB  - Na farmama muznih krava proizvedu se velike količine stajnjaka kao pratećeg proizvoda. Kod vezanog i slobodnog sistema gajenja krava, u stajama uz korišćenje manjih ili većih količina prostirke stvara se čvrsti stajnjak kao mešavina balege, osoke i prostirke. U tradicionalnoj govedarskoj proizvodnji koja je pretežno zastupljena na malim porodičnim gazdinstvima uglavnom se radi o čvrstom stajnjaku. Različiti proizvodni kapaciteti na mlečnim farmama, kao i brojno stanje grla stoke po kategorijama na godišnjem nivou bitno određuju količine dobijenog stajnjaka. Na stajnjak utiču i način držanja grla, primena zootehničkih mera i vrsta prostirke. U radu su izračunate količine čvrstog stajnjaka na farmama kapaciteta 10, 20 i 50 muznih krava, a dat je i sadržaj hranljivih elemenata i procenjena je dobijena vrednost stajnjaka.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Manure management on dairy farms
T1  - Upravljanje stajnjakom na farmama muznih krava
EP  - 93
IS  - 2
SP  - 85
VL  - 42
DO  - 10.5937/SavPoljTeh1602085V
ER  - 

@article{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, D. and Mileusnić, Zoran",
year = "2016",
abstract = "Dairy farms generate large amounts of manure as their by-product. In tie-stall and free-stall housing systems for dairy cows, in barns with a lot of or little bedding used, the solid manure produced is a mixture of dung, urine and bedding. In traditional cattle farming which is mostly practiced on small family farms, the manure generated is mostly solid. The amount of manure available from dairy cattle on an annual basis is substantially dependent on farm production capacity and number and class of cattle. Manure is also affected by housing system, cattle management practices and type of bedding. This study presents the amounts of solid manure obtained on farms of 10, 20 and 50 dairy cows and provides the nutrient content and an estimated value of the manure., Na farmama muznih krava proizvedu se velike količine stajnjaka kao pratećeg proizvoda. Kod vezanog i slobodnog sistema gajenja krava, u stajama uz korišćenje manjih ili većih količina prostirke stvara se čvrsti stajnjak kao mešavina balege, osoke i prostirke. U tradicionalnoj govedarskoj proizvodnji koja je pretežno zastupljena na malim porodičnim gazdinstvima uglavnom se radi o čvrstom stajnjaku. Različiti proizvodni kapaciteti na mlečnim farmama, kao i brojno stanje grla stoke po kategorijama na godišnjem nivou bitno određuju količine dobijenog stajnjaka. Na stajnjak utiču i način držanja grla, primena zootehničkih mera i vrsta prostirke. U radu su izračunate količine čvrstog stajnjaka na farmama kapaciteta 10, 20 i 50 muznih krava, a dat je i sadržaj hranljivih elemenata i procenjena je dobijena vrednost stajnjaka.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Manure management on dairy farms, Upravljanje stajnjakom na farmama muznih krava",
pages = "93-85",
number = "2",
volume = "42",
doi = "10.5937/SavPoljTeh1602085V"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Mileusnić, Z.. (2016). Manure management on dairy farms. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 42(2), 85-93.
https://doi.org/10.5937/SavPoljTeh1602085V

Veljković B, Koprivica R, Radivojević D, Mileusnić Z. Manure management on dairy farms. in Savremena poljoprivredna tehnika. 2016;42(2):85-93.
doi:10.5937/SavPoljTeh1602085V .

Veljković, Biljana, Koprivica, Ranko, Radivojević, D., Mileusnić, Zoran, "Manure management on dairy farms" in Savremena poljoprivredna tehnika, 42, no. 2 (2016):85-93,
https://doi.org/10.5937/SavPoljTeh1602085V . .

TY  - CONF
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Radojicić, Dušan
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5610
AB  - Production of compost from swine manure and straw outside the livestock buildings,is a process that arises as possible solution of numerous farms problems that originates from liquid manure. In order to determine, along with technological and technical parameters, an economic analysis of process is also necessary to make comparison of costing of both procedures (conventional process and the process of composting).
AB  - Proizvodnja komposta na bazi tečnog stajnjaka i slame van stočarskih objekata, nameće se kao rešenje niza problema koje imaju farme sa tečnim stajnjakom. Da bi se utvrdila, pored tehničko-tehnoliških parametrara, i ekonomska analiza postupka, nužno je izvršiti poređenje kalkulacija troškova oba postupka (konvencionalnog postupka i postupka kompostiranja).
C3  - 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016.
T1  - Evaluation of Economic Efficiency of Compost Production Composed From Liquid Manure and Straw
T1  - Procena ekonomske efikasnosti proizvodnje komposta na bazi tečnog stajnjaka i slame
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5610
ER  - 

@conference{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, Dušan and Radojicić, Dušan",
year = "2016",
abstract = "Production of compost from swine manure and straw outside the livestock buildings,is a process that arises as possible solution of numerous farms problems that originates from liquid manure. In order to determine, along with technological and technical parameters, an economic analysis of process is also necessary to make comparison of costing of both procedures (conventional process and the process of composting)., Proizvodnja komposta na bazi tečnog stajnjaka i slame van stočarskih objekata, nameće se kao rešenje niza problema koje imaju farme sa tečnim stajnjakom. Da bi se utvrdila, pored tehničko-tehnoliških parametrara, i ekonomska analiza postupka, nužno je izvršiti poređenje kalkulacija troškova oba postupka (konvencionalnog postupka i postupka kompostiranja).",
journal = "21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016.",
title = "Evaluation of Economic Efficiency of Compost Production Composed From Liquid Manure and Straw, Procena ekonomske efikasnosti proizvodnje komposta na bazi tečnog stajnjaka i slame",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5610"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Radojicić, D.. (2016). Evaluation of Economic Efficiency of Compost Production Composed From Liquid Manure and Straw. in 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016..
https://hdl.handle.net/21.15107/rcub_agrospace_5610

Veljković B, Koprivica R, Radivojević D, Radojicić D. Evaluation of Economic Efficiency of Compost Production Composed From Liquid Manure and Straw. in 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016.. 2016;.
https://hdl.handle.net/21.15107/rcub_agrospace_5610 .

Veljković, Biljana, Koprivica, Ranko, Radivojević, Dušan, Radojicić, Dušan, "Evaluation of Economic Efficiency of Compost Production Composed From Liquid Manure and Straw" in 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016. (2016),
https://hdl.handle.net/21.15107/rcub_agrospace_5610 .

TY  - CONF
AU  - Radivojević, Dušan
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radojicić, Dušan
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5617
AB  - This paper presents the results of research on condition and needs for technical systems in livestock production in Serbia, based on results of agricultural census in year 2012. Findings in the filed of agricultural engineering, part that concerns on fodder production, concentrate feed production, cattle breeding, milk production, fattening beefs production, pig meat production, poultry and eggs production, are covered in this survey. This paper estimates current status regarding production volume, requirements and applied equipment in production processes abroad and domestically. Estimates of possibilities of domestic equipment suppliers to meet those requirements are also given.
AB  - U radu su izloženi rezultati istraživanja stanja i potreba za tehnikom u stočarskoj proizvodnji u Srbiji na osnovu rezultata popisa Poljoprivrede 2012. Obuhvaćena su saznanja u delu poljoprivredne tehnike u proizvodnji kabastih i koncentrovanih stočnih hraniva, saznanja u oblasti govedarske proizvodnje, proizvodnje mleka i tova junadi, proizvodnje svinjskog mesa, živinarskoj proizvodnji. Procenjeno je trenutno stanje po pitanju obima proizvodnje, potreba i primenjene mehanizacije u proizvodnim procesima u svetu i kod nas i dato je mišljenje o mogućnostima domaće industrije da odgovori zadatku proizvodnji opreme u stočarstvu koja bi zadovoljila domaće potrebe po kvalitetu i obimu proizvodnje.
C3  - 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016.
T1  - State Development and Tendency Techniques in Animal Husbandry in Republic of Serbia
T1  - Stanje i tendencije razvoja tehnike u stočarstvu u Republici Srbiji
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5617
ER  - 

@conference{
author = "Radivojević, Dušan and Veljković, Biljana and Koprivica, Ranko and Radojicić, Dušan",
year = "2016",
abstract = "This paper presents the results of research on condition and needs for technical systems in livestock production in Serbia, based on results of agricultural census in year 2012. Findings in the filed of agricultural engineering, part that concerns on fodder production, concentrate feed production, cattle breeding, milk production, fattening beefs production, pig meat production, poultry and eggs production, are covered in this survey. This paper estimates current status regarding production volume, requirements and applied equipment in production processes abroad and domestically. Estimates of possibilities of domestic equipment suppliers to meet those requirements are also given., U radu su izloženi rezultati istraživanja stanja i potreba za tehnikom u stočarskoj proizvodnji u Srbiji na osnovu rezultata popisa Poljoprivrede 2012. Obuhvaćena su saznanja u delu poljoprivredne tehnike u proizvodnji kabastih i koncentrovanih stočnih hraniva, saznanja u oblasti govedarske proizvodnje, proizvodnje mleka i tova junadi, proizvodnje svinjskog mesa, živinarskoj proizvodnji. Procenjeno je trenutno stanje po pitanju obima proizvodnje, potreba i primenjene mehanizacije u proizvodnim procesima u svetu i kod nas i dato je mišljenje o mogućnostima domaće industrije da odgovori zadatku proizvodnji opreme u stočarstvu koja bi zadovoljila domaće potrebe po kvalitetu i obimu proizvodnje.",
journal = "21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016.",
title = "State Development and Tendency Techniques in Animal Husbandry in Republic of Serbia, Stanje i tendencije razvoja tehnike u stočarstvu u Republici Srbiji",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5617"
}

Radivojević, D., Veljković, B., Koprivica, R.,& Radojicić, D.. (2016). State Development and Tendency Techniques in Animal Husbandry in Republic of Serbia. in 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016..
https://hdl.handle.net/21.15107/rcub_agrospace_5617

Radivojević D, Veljković B, Koprivica R, Radojicić D. State Development and Tendency Techniques in Animal Husbandry in Republic of Serbia. in 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016.. 2016;.
https://hdl.handle.net/21.15107/rcub_agrospace_5617 .

Radivojević, Dušan, Veljković, Biljana, Koprivica, Ranko, Radojicić, Dušan, "State Development and Tendency Techniques in Animal Husbandry in Republic of Serbia" in 21. Savetovanje o biotehnologiji sa međunarodnim učešćem, Čačak, 11.- 12. 03. 2016. (2016),
https://hdl.handle.net/21.15107/rcub_agrospace_5617 .

TY  - JOUR
AU  - Barać, Saša
AU  - Petrović, Dragan
AU  - Djikić, A.
AU  - Biberdžić, Milan
AU  - Koprivica, Ranko
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3875
AB  - The paper presents an analysis and comparison of the results of exploitation testing the different machines for soil tillage under conventional and reduced tillage, as well as evaluating the quality of the two types of sowing in the production of buckwheat and winter rye, in the conditions of northern Kosovo and Metohia. The previous crop was mercantile maize. The aim of this study was to determine the effects of the aggregate labor indicators for tillage and seeding, in the production of winter rye and buckwheat, and the results will enable proper selection of appropriate technological and technical systems and pointing out the advantages and disadvantages of the applied systems for tillage and seeding. In a variant of conventional tillage in relation to reduced tillage fuel consumption was higher by 27.41 up to 27.73%, while the yields of buckwheat was lower by 22.02%, and winter rye up to 20.18%. Measured values of longitudinal and lateral distances, and depths of buckwheat and rye seeds, are numerically processed using inverse distance interpolation method. Consequently, an appropriate contour maps that present distributions of relative frequencies with respect to longitudinal and lateral seeding distances, as well as seeding depths, are drawn. These maps clearly illustrate accuracy quality of work and operational stability of two analyzed seeding machines having quire different designs of seeding apparatus, in the working conditions of buckwheat and rye seeding.
AB  - Rad predstavlja analizu i upoređenje rezultata eksploatacionih ispitivanja različitih mašina za obradu zemljišta u okviru konvencionale i redukovane obrade, kao i ocenu kvaliteta rada dva tipa sejalica u proizvodnji heljde i ozime raži u uslovima severnog Kosova i Metohije. Predkultura je bila merkantilni kukuruz. Cilj istraživanja je bio da se utvrde pokazatelji efekata rada agregata za obradu zemljišta i setvu u proizvodnji heljde i ozime raži, a dobijeni rezultati omogućiće pravilan izbor odgovarajućeg tehnološko-tehničkog sistema i ukazati na prednosti i nedostatke primenjenih sistema za obradu zemljišta i setvu. U varijanti konvencionalne obrade u odnosu na redukovanu obradu potrošnja goriva je bila veća za 27,41-27,73%, pri čemu su ostvareni prinosi heljde bili manji za 22,02%, a ozime raži za 20,18%. Kvalitet rada sejalica obuhvatio je određivanje uzdužnog, poprečnog i rasporeda zrna po dubini setvenog sloja. Izmerene vrednosti uzdužnih i poprečnih rastojanja kao i dubine setve heljde i raži, su numerički obrađene metodom interpolacije inverzne udaljenosti. Na osnovu toga, urađene su odgovarajuće konturne mape koje predstavljaju distribucije relativne učestalosti u odnosu na uzdužna i bočna rastojanja semena pri setvi, kao i dubinu setve. Ove mape jasno pokazuju kvalitet rada i radnu stabilnost dveju analiziranih sejalica sa različitom konstrukcijom setvenog aparata, u uslovima rada pri setvi heljde i raži.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Results of testing the machineries for soil tillage and seeding the buckwheat and rye
T1  - Rezultati ispitivanja mašina za obradu zemljišta i setvu heljde i raži
EP  - 34
IS  - 1
SP  - 25
VL  - 41
DO  - 10.5937/SavPoljTeh1501025B
ER  - 

@article{
author = "Barać, Saša and Petrović, Dragan and Djikić, A. and Biberdžić, Milan and Koprivica, Ranko",
year = "2015",
abstract = "The paper presents an analysis and comparison of the results of exploitation testing the different machines for soil tillage under conventional and reduced tillage, as well as evaluating the quality of the two types of sowing in the production of buckwheat and winter rye, in the conditions of northern Kosovo and Metohia. The previous crop was mercantile maize. The aim of this study was to determine the effects of the aggregate labor indicators for tillage and seeding, in the production of winter rye and buckwheat, and the results will enable proper selection of appropriate technological and technical systems and pointing out the advantages and disadvantages of the applied systems for tillage and seeding. In a variant of conventional tillage in relation to reduced tillage fuel consumption was higher by 27.41 up to 27.73%, while the yields of buckwheat was lower by 22.02%, and winter rye up to 20.18%. Measured values of longitudinal and lateral distances, and depths of buckwheat and rye seeds, are numerically processed using inverse distance interpolation method. Consequently, an appropriate contour maps that present distributions of relative frequencies with respect to longitudinal and lateral seeding distances, as well as seeding depths, are drawn. These maps clearly illustrate accuracy quality of work and operational stability of two analyzed seeding machines having quire different designs of seeding apparatus, in the working conditions of buckwheat and rye seeding., Rad predstavlja analizu i upoređenje rezultata eksploatacionih ispitivanja različitih mašina za obradu zemljišta u okviru konvencionale i redukovane obrade, kao i ocenu kvaliteta rada dva tipa sejalica u proizvodnji heljde i ozime raži u uslovima severnog Kosova i Metohije. Predkultura je bila merkantilni kukuruz. Cilj istraživanja je bio da se utvrde pokazatelji efekata rada agregata za obradu zemljišta i setvu u proizvodnji heljde i ozime raži, a dobijeni rezultati omogućiće pravilan izbor odgovarajućeg tehnološko-tehničkog sistema i ukazati na prednosti i nedostatke primenjenih sistema za obradu zemljišta i setvu. U varijanti konvencionalne obrade u odnosu na redukovanu obradu potrošnja goriva je bila veća za 27,41-27,73%, pri čemu su ostvareni prinosi heljde bili manji za 22,02%, a ozime raži za 20,18%. Kvalitet rada sejalica obuhvatio je određivanje uzdužnog, poprečnog i rasporeda zrna po dubini setvenog sloja. Izmerene vrednosti uzdužnih i poprečnih rastojanja kao i dubine setve heljde i raži, su numerički obrađene metodom interpolacije inverzne udaljenosti. Na osnovu toga, urađene su odgovarajuće konturne mape koje predstavljaju distribucije relativne učestalosti u odnosu na uzdužna i bočna rastojanja semena pri setvi, kao i dubinu setve. Ove mape jasno pokazuju kvalitet rada i radnu stabilnost dveju analiziranih sejalica sa različitom konstrukcijom setvenog aparata, u uslovima rada pri setvi heljde i raži.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Results of testing the machineries for soil tillage and seeding the buckwheat and rye, Rezultati ispitivanja mašina za obradu zemljišta i setvu heljde i raži",
pages = "34-25",
number = "1",
volume = "41",
doi = "10.5937/SavPoljTeh1501025B"
}

Barać, S., Petrović, D., Djikić, A., Biberdžić, M.,& Koprivica, R.. (2015). Results of testing the machineries for soil tillage and seeding the buckwheat and rye. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 41(1), 25-34.
https://doi.org/10.5937/SavPoljTeh1501025B

Barać S, Petrović D, Djikić A, Biberdžić M, Koprivica R. Results of testing the machineries for soil tillage and seeding the buckwheat and rye. in Savremena poljoprivredna tehnika. 2015;41(1):25-34.
doi:10.5937/SavPoljTeh1501025B .

Barać, Saša, Petrović, Dragan, Djikić, A., Biberdžić, Milan, Koprivica, Ranko, "Results of testing the machineries for soil tillage and seeding the buckwheat and rye" in Savremena poljoprivredna tehnika, 41, no. 1 (2015):25-34,
https://doi.org/10.5937/SavPoljTeh1501025B . .

TY  - JOUR
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Mileusnić, Zoran
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3993
AB  - In order to approach EU policies in the milk production sector in Serbia, big changes can be expected, according to the experiences of the neighboring countries that have gone through this development process in an easier or harder way. In the foreign trade of milk and dairy products, Serbia has realized positive balance and is one of the leading countries in this production in the region. In order to strengthen the market position of Serbia and observe realistic export potentials, this article analyzes foreign trade balance for dairy products by commodity groups and provides an analysis of the countries that are primarily involved in the exchange of goods. In the period 2008-2013, the Republic of Serbia exported dairy products amounting to 35.2 million dollars, and imported 22.1 million dollars. In terms of value, Serbia exports almost two times more products that are of lower processing level compared to the final products that achieve significantly higher market prices.
AB  - U cilju približavanja politike EU u sektoru proizvodnje mleka u Srbiji mogu se očekivati velike promene o tome govore iskustva zemalja u okruženju koje su lakše ili teže prošle kroz ove razvojne procese. U spoljnotrgovinskoj razmeni mleka i mlečnih proizvoda Srbija ostvaruje pozitivan bilans i predstavlja jednu od vodećih zemalja u ovoj proizvodnji u regionu. Radi jačanja tržišnih pozicija Srbije i sagledavanja realnih izvoznih potencijala u radu je data spoljnotrgovinska analiza mleka i proizvoda po robnim grupama i data je analiza po zemljama koje su primarno uključene u robnu razmenu. U posmatranom periodu 2008-2013 godina Republika Srbija je izvezla mleka i mlečnih proizvoda u vrednosti od 35,2 mil. dolara, a uvezla 22,1 mil. dolara. Sa vrednosnog aspekta Srbija skoro dva puta više izveze proizvode koji su nižeg stepena prerade, u odnosu na finalne proizvode koji postižu znatno veću tržišnu cenu.
PB  - Univerzitet u Novom Sadu - Poljoprivredni fakultet - Departman za ekonomiku poljoprivrede i sociologiju sela, Novi Sad
T2  - Agroekonomika
T1  - Milk and dairy products in the foreign trade balance of Serbia
T1  - Mleko i mlečni proizvodi u spoljnotrgovinskom bilansu Srbije
EP  - 12
IS  - 66
SP  - 1
VL  - 44
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_3993
ER  - 

@article{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, Dušan and Mileusnić, Zoran",
year = "2015",
abstract = "In order to approach EU policies in the milk production sector in Serbia, big changes can be expected, according to the experiences of the neighboring countries that have gone through this development process in an easier or harder way. In the foreign trade of milk and dairy products, Serbia has realized positive balance and is one of the leading countries in this production in the region. In order to strengthen the market position of Serbia and observe realistic export potentials, this article analyzes foreign trade balance for dairy products by commodity groups and provides an analysis of the countries that are primarily involved in the exchange of goods. In the period 2008-2013, the Republic of Serbia exported dairy products amounting to 35.2 million dollars, and imported 22.1 million dollars. In terms of value, Serbia exports almost two times more products that are of lower processing level compared to the final products that achieve significantly higher market prices., U cilju približavanja politike EU u sektoru proizvodnje mleka u Srbiji mogu se očekivati velike promene o tome govore iskustva zemalja u okruženju koje su lakše ili teže prošle kroz ove razvojne procese. U spoljnotrgovinskoj razmeni mleka i mlečnih proizvoda Srbija ostvaruje pozitivan bilans i predstavlja jednu od vodećih zemalja u ovoj proizvodnji u regionu. Radi jačanja tržišnih pozicija Srbije i sagledavanja realnih izvoznih potencijala u radu je data spoljnotrgovinska analiza mleka i proizvoda po robnim grupama i data je analiza po zemljama koje su primarno uključene u robnu razmenu. U posmatranom periodu 2008-2013 godina Republika Srbija je izvezla mleka i mlečnih proizvoda u vrednosti od 35,2 mil. dolara, a uvezla 22,1 mil. dolara. Sa vrednosnog aspekta Srbija skoro dva puta više izveze proizvode koji su nižeg stepena prerade, u odnosu na finalne proizvode koji postižu znatno veću tržišnu cenu.",
publisher = "Univerzitet u Novom Sadu - Poljoprivredni fakultet - Departman za ekonomiku poljoprivrede i sociologiju sela, Novi Sad",
journal = "Agroekonomika",
title = "Milk and dairy products in the foreign trade balance of Serbia, Mleko i mlečni proizvodi u spoljnotrgovinskom bilansu Srbije",
pages = "12-1",
number = "66",
volume = "44",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_3993"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Mileusnić, Z.. (2015). Milk and dairy products in the foreign trade balance of Serbia. in Agroekonomika
Univerzitet u Novom Sadu - Poljoprivredni fakultet - Departman za ekonomiku poljoprivrede i sociologiju sela, Novi Sad., 44(66), 1-12.
https://hdl.handle.net/21.15107/rcub_agrospace_3993

Veljković B, Koprivica R, Radivojević D, Mileusnić Z. Milk and dairy products in the foreign trade balance of Serbia. in Agroekonomika. 2015;44(66):1-12.
https://hdl.handle.net/21.15107/rcub_agrospace_3993 .

Veljković, Biljana, Koprivica, Ranko, Radivojević, Dušan, Mileusnić, Zoran, "Milk and dairy products in the foreign trade balance of Serbia" in Agroekonomika, 44, no. 66 (2015):1-12,
https://hdl.handle.net/21.15107/rcub_agrospace_3993 .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Turan, Jan
AU  - Pajić, Miloš
AU  - Miodragović, Rajko
AU  - Radojević, Rade
PY  - 2014
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3566
AB  - The biggest problem in seed birdsfoot trefoil harvest is pod cracking before and during harvest. At full maturity, birdsfoot trefoil pods crack easily, resulting in seed spillage and hence seed losses. The cracking pod problem significantly limits the successful production of seeds. Exploitation indices, operational performance and reliability of a used general-purpose Claas Mercator 50 combine harvester in harvesting birdsfoot trefoil seed were studied. The testing was carried out in field conditions in Western Serbia area. The losses of grain over the cutter bar and over the threshing machine were found out.Total header and thresher losses ranged from 21.28% to 23.86% at an operating speed of 2.04 km/h and 2.63 km/h, respectively. This is an expected result for the crop under increased crop moisture conditions. There was loss of operating time i.e. congestion of unharvested grain due to increased operating rate, seed moisture and straw. Time consumption for elimination of harvesting delay at a rate of 2.63 km/h was higher than at a rate of 2.04 km/h and accounted for 13.48% of the total operating time. The research also involved monitoring of intensity pod cracking during the day depending on air temperature. Birdsfoot trefoil pod opening intensity increased of starts after 11 a.m. at air temperatures over 30 0 C when 80-90% of pods crack at 17- 20% moisture.
AB  - U žetvi semena žutog zvezdana najveći problem predstavlja otvaranje mahuna pre i toku žetve. U punoj zrelosti mahune žutog zvezdana lako se otvaraju i seme se prosipa što dovodi do gubitaka. Problem otvaranja mahuna u značajnoj meri limitira uspešnu proizvodnju semena. Istraživani su eksplatacioni pokazatelji, kvalitet rada i pouzdanost starog univerzalnog žitnog kombajna 'Claas Mercator 50' u žetvi semena žutog zvezdana. Ispitivanje je obavljeno u poljskim uslovima Zapadne Sbije. Ustanovljeni su gubici na hederu i vršalici kombajna. Ukupni gubici hedera i vršalice na ispitivanom kombajnu iznosili su od 21,28% do 23,86% pri radnim brzinama 2,04 km/h i 2,63 km/h, što se moglo i očekivati za pomenuti kombajn i ovu kulturu u uslovima povećane vlažnosti useva. Tokom rada kombajna dolazilo je do zastoja tj. zagušenja vršidbene mase, usled povećane radna brzina, vlažnosti semena i slame. Utrošeno vreme za otklanjanje tehnoloških zastoja kod radne brzine od 2,63 km/h bilo je veće nego kod brzine od 2,04 km/h i iznosilo je 13,48% od ukupnog radnog vremena. Intenzitet pucanja u toku dana zavisno od temperature je takođe bio predmet ispitivanja ovog rada. Povećani intenzitet otvaranja mahuna počinje posle 11 sati, pri temperaturi vaduha preko 30 0 C kada se otvori 80-90% mahuna vlažnosti od 17- 20%.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Single phase harvest of birdsfoot trefoil seed by general-purpose combine harvesters
T1  - Jednofazna žetva semena žutog zvezdana univerzalnim žitnim kombajnom
EP  - 160
IS  - 3
SP  - 151
VL  - 40
DO  - 10.5937/SavPoljTeh1403151K
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Turan, Jan and Pajić, Miloš and Miodragović, Rajko and Radojević, Rade",
year = "2014",
abstract = "The biggest problem in seed birdsfoot trefoil harvest is pod cracking before and during harvest. At full maturity, birdsfoot trefoil pods crack easily, resulting in seed spillage and hence seed losses. The cracking pod problem significantly limits the successful production of seeds. Exploitation indices, operational performance and reliability of a used general-purpose Claas Mercator 50 combine harvester in harvesting birdsfoot trefoil seed were studied. The testing was carried out in field conditions in Western Serbia area. The losses of grain over the cutter bar and over the threshing machine were found out.Total header and thresher losses ranged from 21.28% to 23.86% at an operating speed of 2.04 km/h and 2.63 km/h, respectively. This is an expected result for the crop under increased crop moisture conditions. There was loss of operating time i.e. congestion of unharvested grain due to increased operating rate, seed moisture and straw. Time consumption for elimination of harvesting delay at a rate of 2.63 km/h was higher than at a rate of 2.04 km/h and accounted for 13.48% of the total operating time. The research also involved monitoring of intensity pod cracking during the day depending on air temperature. Birdsfoot trefoil pod opening intensity increased of starts after 11 a.m. at air temperatures over 30 0 C when 80-90% of pods crack at 17- 20% moisture., U žetvi semena žutog zvezdana najveći problem predstavlja otvaranje mahuna pre i toku žetve. U punoj zrelosti mahune žutog zvezdana lako se otvaraju i seme se prosipa što dovodi do gubitaka. Problem otvaranja mahuna u značajnoj meri limitira uspešnu proizvodnju semena. Istraživani su eksplatacioni pokazatelji, kvalitet rada i pouzdanost starog univerzalnog žitnog kombajna 'Claas Mercator 50' u žetvi semena žutog zvezdana. Ispitivanje je obavljeno u poljskim uslovima Zapadne Sbije. Ustanovljeni su gubici na hederu i vršalici kombajna. Ukupni gubici hedera i vršalice na ispitivanom kombajnu iznosili su od 21,28% do 23,86% pri radnim brzinama 2,04 km/h i 2,63 km/h, što se moglo i očekivati za pomenuti kombajn i ovu kulturu u uslovima povećane vlažnosti useva. Tokom rada kombajna dolazilo je do zastoja tj. zagušenja vršidbene mase, usled povećane radna brzina, vlažnosti semena i slame. Utrošeno vreme za otklanjanje tehnoloških zastoja kod radne brzine od 2,63 km/h bilo je veće nego kod brzine od 2,04 km/h i iznosilo je 13,48% od ukupnog radnog vremena. Intenzitet pucanja u toku dana zavisno od temperature je takođe bio predmet ispitivanja ovog rada. Povećani intenzitet otvaranja mahuna počinje posle 11 sati, pri temperaturi vaduha preko 30 0 C kada se otvori 80-90% mahuna vlažnosti od 17- 20%.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Single phase harvest of birdsfoot trefoil seed by general-purpose combine harvesters, Jednofazna žetva semena žutog zvezdana univerzalnim žitnim kombajnom",
pages = "160-151",
number = "3",
volume = "40",
doi = "10.5937/SavPoljTeh1403151K"
}

Koprivica, R., Veljković, B., Turan, J., Pajić, M., Miodragović, R.,& Radojević, R.. (2014). Single phase harvest of birdsfoot trefoil seed by general-purpose combine harvesters. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 40(3), 151-160.
https://doi.org/10.5937/SavPoljTeh1403151K

Koprivica R, Veljković B, Turan J, Pajić M, Miodragović R, Radojević R. Single phase harvest of birdsfoot trefoil seed by general-purpose combine harvesters. in Savremena poljoprivredna tehnika. 2014;40(3):151-160.
doi:10.5937/SavPoljTeh1403151K .

Koprivica, Ranko, Veljković, Biljana, Turan, Jan, Pajić, Miloš, Miodragović, Rajko, Radojević, Rade, "Single phase harvest of birdsfoot trefoil seed by general-purpose combine harvesters" in Savremena poljoprivredna tehnika, 40, no. 3 (2014):151-160,
https://doi.org/10.5937/SavPoljTeh1403151K . .

TY  - CONF
AU  - Radivojević, Dušan
AU  - Radojičić, Dušan
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Ivanović, Sanjin
PY  - 2014
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3397
AB  - Production of compost from mixture of liquid manure and wheat straw is achievable process. In order to obtain final product of good quality, it is necessary to achieve total control of process. In the production process, essential changes in properties were recorded, compared to initial stage. Organic fertilizer of excellent quality was produced by composting the mixture of liquid manure and wheat straw. Prior to composting, components were mixed in fixed ratio. Production process involves aerobic treatment of mixture, by turning the mass frequently. Mixture of manure and straw was placed on the concrete surface in form of prisms, 3m wide and 1m high. Special machine for mass turning was used. The most important parameters for composting process, and their changes during treatment were monitored (changes in temperature, mass, height, bulk density, moisture content, N content, organic dry matter content, pH level C/N ratio).
PB  - Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb
C3  - Aktualni Zadaci Mehanizacije Poljoprivrede
T1  - Determination of influential parameters for composting of liquid manure with wheat straw
EP  - 261
SP  - 251
VL  - 42
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_3397
ER  - 

@conference{
author = "Radivojević, Dušan and Radojičić, Dušan and Veljković, Biljana and Koprivica, Ranko and Ivanović, Sanjin",
year = "2014",
abstract = "Production of compost from mixture of liquid manure and wheat straw is achievable process. In order to obtain final product of good quality, it is necessary to achieve total control of process. In the production process, essential changes in properties were recorded, compared to initial stage. Organic fertilizer of excellent quality was produced by composting the mixture of liquid manure and wheat straw. Prior to composting, components were mixed in fixed ratio. Production process involves aerobic treatment of mixture, by turning the mass frequently. Mixture of manure and straw was placed on the concrete surface in form of prisms, 3m wide and 1m high. Special machine for mass turning was used. The most important parameters for composting process, and their changes during treatment were monitored (changes in temperature, mass, height, bulk density, moisture content, N content, organic dry matter content, pH level C/N ratio).",
publisher = "Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb",
journal = "Aktualni Zadaci Mehanizacije Poljoprivrede",
title = "Determination of influential parameters for composting of liquid manure with wheat straw",
pages = "261-251",
volume = "42",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_3397"
}

Radivojević, D., Radojičić, D., Veljković, B., Koprivica, R.,& Ivanović, S.. (2014). Determination of influential parameters for composting of liquid manure with wheat straw. in Aktualni Zadaci Mehanizacije Poljoprivrede
Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb., 42, 251-261.
https://hdl.handle.net/21.15107/rcub_agrospace_3397

Radivojević D, Radojičić D, Veljković B, Koprivica R, Ivanović S. Determination of influential parameters for composting of liquid manure with wheat straw. in Aktualni Zadaci Mehanizacije Poljoprivrede. 2014;42:251-261.
https://hdl.handle.net/21.15107/rcub_agrospace_3397 .

Radivojević, Dušan, Radojičić, Dušan, Veljković, Biljana, Koprivica, Ranko, Ivanović, Sanjin, "Determination of influential parameters for composting of liquid manure with wheat straw" in Aktualni Zadaci Mehanizacije Poljoprivrede, 42 (2014):251-261,
https://hdl.handle.net/21.15107/rcub_agrospace_3397 .

TY  - JOUR
AU  - Živković, Milovan
AU  - Urošević, Mirko
AU  - Pajić, Miloš
AU  - Koprivica, Ranko
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2839
AB  - Modern technologies of the fruit and wine production include implementation of the intensive plantation pruning where the accumulated considerable amounts of plant biomass residue have significant environmental and energy value. Thermal energy and the use of pruning residues as biomass are important from the point of view of environmental protection and the closed-cycle of CO2 emission and consumption. Remains of the pruning in the orchards represent a problem during the implementation of agricultural practices, so necessity for their disposal from these surfaces exists. Fossil fuel limited reserves and the environmental pollution impose the necessity of finding alternative and renewable energy resources with the environmental pollution reduction. Very important problem is to correctly define the optimal technical solutions and technologies for utilization of machine pruning of fruit trees and vines, which will increase the energy efficiency of the production. Outdated technologies, extensive production and inefficient consumption of energy in our country environment, haven't been helping in the suitable application of the collecting, preparing and using of the remains of the pruning. The prerequisite for the study of the economic and technical feasibility for the using of pruning residues (biomaterials) are the information about the quantity, the energy potential, the workmanship, the transportability, the price, the storage convenience, the preservation and the combustion. The essential starting point for this research is the annually definition of the energy potential of the pruning residues. .
AB  - Savremene tehnologije voćarsko-vinogradarske proizvodnje podrazumevaju sprovođenje intenzivne rezidbe zasada gde nastaju znatne količine biljnih ostatka koji predstavljaju biomasu znatne ekološke i energetske vrednosti. Dobijanje toplotne energije i upotreba ostataka rezidbe kao biomase značajna je sa stanovišta zaštite okoline, zbog zatvorenog ciklusa emisije i potrošnje CO2. Ostatci rezidbe u zasadima predstavljaju problem u sprovođenju agrotehničkih mera, tako da je neophodno njihovo iznošenje sa navedenih površina. Ograničene rezerve fosilnih goriva i veliko zagađenje životne sredine nameću potrebu iznalaženja alternativnih i obnovljivih izvora energije koji istovremeno smanjuju ekološko zagađenje. Veoma aktuelni problem predstavlja definisanje optimalnih tehnologija i tehničkih rešenja mašina za korišćenje ostataka rezidbe voćaka i vinove loze, što znatno povećava energetsku efikasnost ove proizvodnje. Zastarele tehnologije, ekstenzivna proizvodnja i neracionalno raspolaganje energijom, u našim uslovima, prikupljanje, obrada, priprema i korišćenje biljnih ostataka nisu našli adekvatnu primenu. Preduslov za istraživanje ekonomske i tehničke opravdanosti korišćenja ostataka rezidbe (biomaterijala) predstavljaju podaci o količini, energetskom potencijalu, načinu obrade, transportabilnosti, ceni, pogodnosti za skladištenje, čuvanje i sagorevanje. Najznačajnije polazište tom istraživanju je definisanje energetskog potencijala ostataka rezidbe na godišnjem nivou. .
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Energy potential of products of fruit and grape plantations pruning in Serbia
T1  - Energetski potencijal produkata rezidbe voćarskih i vinogradarskih zasada Srbije
EP  - 77
IS  - 4
SP  - 69
VL  - 37
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_2839
ER  - 

@article{
author = "Živković, Milovan and Urošević, Mirko and Pajić, Miloš and Koprivica, Ranko",
year = "2012",
abstract = "Modern technologies of the fruit and wine production include implementation of the intensive plantation pruning where the accumulated considerable amounts of plant biomass residue have significant environmental and energy value. Thermal energy and the use of pruning residues as biomass are important from the point of view of environmental protection and the closed-cycle of CO2 emission and consumption. Remains of the pruning in the orchards represent a problem during the implementation of agricultural practices, so necessity for their disposal from these surfaces exists. Fossil fuel limited reserves and the environmental pollution impose the necessity of finding alternative and renewable energy resources with the environmental pollution reduction. Very important problem is to correctly define the optimal technical solutions and technologies for utilization of machine pruning of fruit trees and vines, which will increase the energy efficiency of the production. Outdated technologies, extensive production and inefficient consumption of energy in our country environment, haven't been helping in the suitable application of the collecting, preparing and using of the remains of the pruning. The prerequisite for the study of the economic and technical feasibility for the using of pruning residues (biomaterials) are the information about the quantity, the energy potential, the workmanship, the transportability, the price, the storage convenience, the preservation and the combustion. The essential starting point for this research is the annually definition of the energy potential of the pruning residues. ., Savremene tehnologije voćarsko-vinogradarske proizvodnje podrazumevaju sprovođenje intenzivne rezidbe zasada gde nastaju znatne količine biljnih ostatka koji predstavljaju biomasu znatne ekološke i energetske vrednosti. Dobijanje toplotne energije i upotreba ostataka rezidbe kao biomase značajna je sa stanovišta zaštite okoline, zbog zatvorenog ciklusa emisije i potrošnje CO2. Ostatci rezidbe u zasadima predstavljaju problem u sprovođenju agrotehničkih mera, tako da je neophodno njihovo iznošenje sa navedenih površina. Ograničene rezerve fosilnih goriva i veliko zagađenje životne sredine nameću potrebu iznalaženja alternativnih i obnovljivih izvora energije koji istovremeno smanjuju ekološko zagađenje. Veoma aktuelni problem predstavlja definisanje optimalnih tehnologija i tehničkih rešenja mašina za korišćenje ostataka rezidbe voćaka i vinove loze, što znatno povećava energetsku efikasnost ove proizvodnje. Zastarele tehnologije, ekstenzivna proizvodnja i neracionalno raspolaganje energijom, u našim uslovima, prikupljanje, obrada, priprema i korišćenje biljnih ostataka nisu našli adekvatnu primenu. Preduslov za istraživanje ekonomske i tehničke opravdanosti korišćenja ostataka rezidbe (biomaterijala) predstavljaju podaci o količini, energetskom potencijalu, načinu obrade, transportabilnosti, ceni, pogodnosti za skladištenje, čuvanje i sagorevanje. Najznačajnije polazište tom istraživanju je definisanje energetskog potencijala ostataka rezidbe na godišnjem nivou. .",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Energy potential of products of fruit and grape plantations pruning in Serbia, Energetski potencijal produkata rezidbe voćarskih i vinogradarskih zasada Srbije",
pages = "77-69",
number = "4",
volume = "37",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_2839"
}

Živković, M., Urošević, M., Pajić, M.,& Koprivica, R.. (2012). Energy potential of products of fruit and grape plantations pruning in Serbia. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 37(4), 69-77.
https://hdl.handle.net/21.15107/rcub_agrospace_2839

Živković M, Urošević M, Pajić M, Koprivica R. Energy potential of products of fruit and grape plantations pruning in Serbia. in Poljoprivredna tehnika. 2012;37(4):69-77.
https://hdl.handle.net/21.15107/rcub_agrospace_2839 .

Živković, Milovan, Urošević, Mirko, Pajić, Miloš, Koprivica, Ranko, "Energy potential of products of fruit and grape plantations pruning in Serbia" in Poljoprivredna tehnika, 37, no. 4 (2012):69-77,
https://hdl.handle.net/21.15107/rcub_agrospace_2839 .

TY  - JOUR
AU  - Radivojević, Dušan
AU  - Ivanović, Sanjin
AU  - Radojičić, Dušan
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Božić, Steva
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2884
AB  - The aerobic treatment of solid manure increases the content of total and easily available amounts of N, P2O5, K2O by 3.76 times on average in comparison with raw solid manure, and makes the maturation time eight time as short, which is significant for several reasons. In this paper, we showed that the price of the substitution of compost derived from aerobic processing is 4.24 times as high in comparison with the price of the substitution of burnt manure derived through anaerobic processing. By applying different dynamic methods for the assessment of investments, a fact was established that investing in the purchase of a machine for the aerobic processing of manure is economically justified and financially acceptable for farms with 19 and more cows. .
AB  - Aerobnom negom čvrstog stajnjaka povećava se sadržaj ukupnih i lako pristupačnih količina N, P2O5, K2O, u odnosu na sirovi čvrsti stajnjak prosečno za 3,76 puta, a vreme dozrevanja skraćuje osam puta što ima višestruki značaj. U radu je pokazano da je cena zamene komposta dobijenog aerobnom obradom 4,24 puta veća u odnosu na cenu zamene zgorelog stajnjaka dobijenog anaerobnom obradom. Primenom različitih dinamičkih metoda za ocenu investicija utvrđeno je da je investicija u nabavku mašine za aerobnu obradu stajnjaka ekonomski opravdana i finansijski prihvatljiva za farme koje poseduju 19 i više krava. .
PB  - Naučno društvo agrarnih ekonomista Balkana, Beograd, Institut za ekonomiku poljoprivrede, Beograd i Akademija ekonomskih nauka, Bukurešt
T2  - Ekonomika poljoprivrede
T1  - The nutritive and economic effects of aerobic treatment of solid manure
T1  - Nutritivni i ekonomski efekti aerobne nege čvrstog stajnjaka
EP  - 411
IS  - 3
SP  - 401
VL  - 59
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_2884
ER  - 

@article{
author = "Radivojević, Dušan and Ivanović, Sanjin and Radojičić, Dušan and Veljković, Biljana and Koprivica, Ranko and Božić, Steva",
year = "2012",
abstract = "The aerobic treatment of solid manure increases the content of total and easily available amounts of N, P2O5, K2O by 3.76 times on average in comparison with raw solid manure, and makes the maturation time eight time as short, which is significant for several reasons. In this paper, we showed that the price of the substitution of compost derived from aerobic processing is 4.24 times as high in comparison with the price of the substitution of burnt manure derived through anaerobic processing. By applying different dynamic methods for the assessment of investments, a fact was established that investing in the purchase of a machine for the aerobic processing of manure is economically justified and financially acceptable for farms with 19 and more cows. ., Aerobnom negom čvrstog stajnjaka povećava se sadržaj ukupnih i lako pristupačnih količina N, P2O5, K2O, u odnosu na sirovi čvrsti stajnjak prosečno za 3,76 puta, a vreme dozrevanja skraćuje osam puta što ima višestruki značaj. U radu je pokazano da je cena zamene komposta dobijenog aerobnom obradom 4,24 puta veća u odnosu na cenu zamene zgorelog stajnjaka dobijenog anaerobnom obradom. Primenom različitih dinamičkih metoda za ocenu investicija utvrđeno je da je investicija u nabavku mašine za aerobnu obradu stajnjaka ekonomski opravdana i finansijski prihvatljiva za farme koje poseduju 19 i više krava. .",
publisher = "Naučno društvo agrarnih ekonomista Balkana, Beograd, Institut za ekonomiku poljoprivrede, Beograd i Akademija ekonomskih nauka, Bukurešt",
journal = "Ekonomika poljoprivrede",
title = "The nutritive and economic effects of aerobic treatment of solid manure, Nutritivni i ekonomski efekti aerobne nege čvrstog stajnjaka",
pages = "411-401",
number = "3",
volume = "59",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_2884"
}

Radivojević, D., Ivanović, S., Radojičić, D., Veljković, B., Koprivica, R.,& Božić, S.. (2012). The nutritive and economic effects of aerobic treatment of solid manure. in Ekonomika poljoprivrede
Naučno društvo agrarnih ekonomista Balkana, Beograd, Institut za ekonomiku poljoprivrede, Beograd i Akademija ekonomskih nauka, Bukurešt., 59(3), 401-411.
https://hdl.handle.net/21.15107/rcub_agrospace_2884

Radivojević D, Ivanović S, Radojičić D, Veljković B, Koprivica R, Božić S. The nutritive and economic effects of aerobic treatment of solid manure. in Ekonomika poljoprivrede. 2012;59(3):401-411.
https://hdl.handle.net/21.15107/rcub_agrospace_2884 .

Radivojević, Dušan, Ivanović, Sanjin, Radojičić, Dušan, Veljković, Biljana, Koprivica, Ranko, Božić, Steva, "The nutritive and economic effects of aerobic treatment of solid manure" in Ekonomika poljoprivrede, 59, no. 3 (2012):401-411,
https://hdl.handle.net/21.15107/rcub_agrospace_2884 .

TY  - JOUR
AU  - Radivojević, Dušan
AU  - Ivanović, Sanjin
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radojičić, Dušan
AU  - Božić, Steva
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2462
AB  - If the procedures of preparation for milking and finishing operations are conducted correctly, then it can be expected to produce top-quality milk. It is, therefore, necessary to know the basis of physiology of milk secretion, possible sources of contamination and handling procedures with milk after the milking. One of the essential conditions for reducing clinical and subclinical udder diseases and top-quality milk production (somatic cells count ≤ 400000/ml, the total number of microorganisms ≤100000/ml) is milking procedure that involves stimulating and hygienic procedures of udder preparation, milking process, after milking procedures and hygiene of milking equipment. The subject of this study was to determine the influence of preparatory procedures for milking, as well as the milking with different types of milking equipments on hygienic and bacteriological safety of raw milk on family farms.
AB  - Ukoliko se postupci pripreme za mužu, muža i završne operacije, izvode pravilno, onda se može dobiti mleko vrhunskog kvaliteta. Zato je neophodno poznavanje osnova fiziologije lučenja mleka, mogućih izvora kontaminacije i postupaka sa mlekom posle muže. Jedan od bitnih uslova da se smanje kliničke i subkliničke bolesti vimena i proizvede mleko ekstra klase (broj somatskih ćelija ≤ 400000/ml, ukupan broj mikroorganizama ≤ 100000/ml) jeste procedura muže koja obuhvata stimulativne i higijenske procedure pripreme vimena, tok muže, proceduru nakon muže i higijenu aparata za mužu. Predmet istraživanja je bio da se utvrdi uticaj pripremnih postupaka muže, kao i sam proces muže različitim tipovima muznih uređaja na higijensku i bakteriološku ispravnost sirovog mleka na porodičnim farmama.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Influence of different types of milking equipment on milk quality during milking procedure of cows
T1  - Uticaj različitih muznih sistema na kvalitet mleka u toku muže krava
EP  - 9
IS  - 4
SP  - 1
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_2462
ER  - 

@article{
author = "Radivojević, Dušan and Ivanović, Sanjin and Veljković, Biljana and Koprivica, Ranko and Radojičić, Dušan and Božić, Steva",
year = "2011",
abstract = "If the procedures of preparation for milking and finishing operations are conducted correctly, then it can be expected to produce top-quality milk. It is, therefore, necessary to know the basis of physiology of milk secretion, possible sources of contamination and handling procedures with milk after the milking. One of the essential conditions for reducing clinical and subclinical udder diseases and top-quality milk production (somatic cells count ≤ 400000/ml, the total number of microorganisms ≤100000/ml) is milking procedure that involves stimulating and hygienic procedures of udder preparation, milking process, after milking procedures and hygiene of milking equipment. The subject of this study was to determine the influence of preparatory procedures for milking, as well as the milking with different types of milking equipments on hygienic and bacteriological safety of raw milk on family farms., Ukoliko se postupci pripreme za mužu, muža i završne operacije, izvode pravilno, onda se može dobiti mleko vrhunskog kvaliteta. Zato je neophodno poznavanje osnova fiziologije lučenja mleka, mogućih izvora kontaminacije i postupaka sa mlekom posle muže. Jedan od bitnih uslova da se smanje kliničke i subkliničke bolesti vimena i proizvede mleko ekstra klase (broj somatskih ćelija ≤ 400000/ml, ukupan broj mikroorganizama ≤ 100000/ml) jeste procedura muže koja obuhvata stimulativne i higijenske procedure pripreme vimena, tok muže, proceduru nakon muže i higijenu aparata za mužu. Predmet istraživanja je bio da se utvrdi uticaj pripremnih postupaka muže, kao i sam proces muže različitim tipovima muznih uređaja na higijensku i bakteriološku ispravnost sirovog mleka na porodičnim farmama.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Influence of different types of milking equipment on milk quality during milking procedure of cows, Uticaj različitih muznih sistema na kvalitet mleka u toku muže krava",
pages = "9-1",
number = "4",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_2462"
}

Radivojević, D., Ivanović, S., Veljković, B., Koprivica, R., Radojičić, D.,& Božić, S.. (2011). Influence of different types of milking equipment on milk quality during milking procedure of cows. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 36(4), 1-9.
https://hdl.handle.net/21.15107/rcub_agrospace_2462

Radivojević D, Ivanović S, Veljković B, Koprivica R, Radojičić D, Božić S. Influence of different types of milking equipment on milk quality during milking procedure of cows. in Poljoprivredna tehnika. 2011;36(4):1-9.
https://hdl.handle.net/21.15107/rcub_agrospace_2462 .

Radivojević, Dušan, Ivanović, Sanjin, Veljković, Biljana, Koprivica, Ranko, Radojičić, Dušan, Božić, Steva, "Influence of different types of milking equipment on milk quality during milking procedure of cows" in Poljoprivredna tehnika, 36, no. 4 (2011):1-9,
https://hdl.handle.net/21.15107/rcub_agrospace_2462 .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Stanimirović, Nebojša
AU  - Topisirović, Goran
PY  - 2009
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1905
AB  - The research was conducted on commercial family farms in the region of Western Serbia. The objective of this study was to evaluate the performance characteristics and operating reliability of the used/old self-propelled John Deere 5820 harvester owned by the Mitrovic Brothers family farm. The harvester was used for preparing ZP-735 hybrid maize silage, with the average maize yield and forage moisture being 24.35 t/ha and 60%, respectively. Under operating conditions, at the lowest operating speed of 2.99 km/ha, the harvester had a harvesting capacity of 28.55 t/ha. With an increase in operating speed to 4.5 km/ha, the harvesting performance was raised to 37.40 t/h. During the season, the harvester ensiled 125 ha at an average daily efficiency of 7.25 ha. The harvester operated in a high-quality and reliable manner without any major breakdown, which suggested that used harvesters, if properly maintained, can exhibit good operational efficiency. Ensiling costs at the test field on the commercial farm were 1.54 diners per kilogram.
AB  - Istraživanja su obavljena na porodičnim komercijalnim farmama užeg područja Zapadne Srbije. Sa ciljem da se utvrde eksploatacione karakteristike i pouzdanost u radu polovnog samohodnog kombajna John Deere 5820 u vlasništvu porodične farme 'Braća Mitrović'. Kombajn je korišćen u procesu siliranja hibridnog kukuruza ZP-735, čiji je prosečan prinos iznosio 24,35 t/ha, a vlažnost mase je bila 60%. Kombajn je u proizvodnim uslovima rada pri najmanjoj brzini od 2,99 km/h ostvario propusnu moć od 28,55 t/h. Sa povećanjem brzine rada na 4,5 km/h ostvarena je veća produktivnost, koja je iznosila 37,40 t/h. U toku sezone kombajn je silirao 125 ha sa prosečnim dnevnim učinkom od 7,25 ha. Kombajn je kvalitetno i pouzdano radio bez većih kvarova, što ukazuje na to da i polovni kombajni ukoliko se pravilno održavaju mogu da ostvare dobar radni efekat. Troškovi siliranja na komercijalnoj farmi, na ispitivanim parcelama iznosili su 1,54 dinara po kilogramu.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Performance characteristics of the John Deere 5820 harvester used for preparing maize silage for dairy cattle on family farms
T1  - Eksplatacione karakteristike kombajna John Deere 5820 u pripremi kukuruzne silaže za muzne krave na porodičnim farmama
EP  - 30
IS  - 3
SP  - 23
VL  - 34
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_1905
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Stanimirović, Nebojša and Topisirović, Goran",
year = "2009",
abstract = "The research was conducted on commercial family farms in the region of Western Serbia. The objective of this study was to evaluate the performance characteristics and operating reliability of the used/old self-propelled John Deere 5820 harvester owned by the Mitrovic Brothers family farm. The harvester was used for preparing ZP-735 hybrid maize silage, with the average maize yield and forage moisture being 24.35 t/ha and 60%, respectively. Under operating conditions, at the lowest operating speed of 2.99 km/ha, the harvester had a harvesting capacity of 28.55 t/ha. With an increase in operating speed to 4.5 km/ha, the harvesting performance was raised to 37.40 t/h. During the season, the harvester ensiled 125 ha at an average daily efficiency of 7.25 ha. The harvester operated in a high-quality and reliable manner without any major breakdown, which suggested that used harvesters, if properly maintained, can exhibit good operational efficiency. Ensiling costs at the test field on the commercial farm were 1.54 diners per kilogram., Istraživanja su obavljena na porodičnim komercijalnim farmama užeg područja Zapadne Srbije. Sa ciljem da se utvrde eksploatacione karakteristike i pouzdanost u radu polovnog samohodnog kombajna John Deere 5820 u vlasništvu porodične farme 'Braća Mitrović'. Kombajn je korišćen u procesu siliranja hibridnog kukuruza ZP-735, čiji je prosečan prinos iznosio 24,35 t/ha, a vlažnost mase je bila 60%. Kombajn je u proizvodnim uslovima rada pri najmanjoj brzini od 2,99 km/h ostvario propusnu moć od 28,55 t/h. Sa povećanjem brzine rada na 4,5 km/h ostvarena je veća produktivnost, koja je iznosila 37,40 t/h. U toku sezone kombajn je silirao 125 ha sa prosečnim dnevnim učinkom od 7,25 ha. Kombajn je kvalitetno i pouzdano radio bez većih kvarova, što ukazuje na to da i polovni kombajni ukoliko se pravilno održavaju mogu da ostvare dobar radni efekat. Troškovi siliranja na komercijalnoj farmi, na ispitivanim parcelama iznosili su 1,54 dinara po kilogramu.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Performance characteristics of the John Deere 5820 harvester used for preparing maize silage for dairy cattle on family farms, Eksplatacione karakteristike kombajna John Deere 5820 u pripremi kukuruzne silaže za muzne krave na porodičnim farmama",
pages = "30-23",
number = "3",
volume = "34",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_1905"
}

Koprivica, R., Veljković, B., Stanimirović, N.,& Topisirović, G.. (2009). Performance characteristics of the John Deere 5820 harvester used for preparing maize silage for dairy cattle on family farms. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 34(3), 23-30.
https://hdl.handle.net/21.15107/rcub_agrospace_1905

Koprivica R, Veljković B, Stanimirović N, Topisirović G. Performance characteristics of the John Deere 5820 harvester used for preparing maize silage for dairy cattle on family farms. in Poljoprivredna tehnika. 2009;34(3):23-30.
https://hdl.handle.net/21.15107/rcub_agrospace_1905 .

Koprivica, Ranko, Veljković, Biljana, Stanimirović, Nebojša, Topisirović, Goran, "Performance characteristics of the John Deere 5820 harvester used for preparing maize silage for dairy cattle on family farms" in Poljoprivredna tehnika, 34, no. 3 (2009):23-30,
https://hdl.handle.net/21.15107/rcub_agrospace_1905 .

TY  - JOUR
AU  - Stanimirović, Nebojša
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Topisirović, Goran
PY  - 2008
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1737
AB  - Results of quantitative and qualitative maize plants analysis were presented in the paper. Analyzed maize plants were cut and chopped by hand, into pieces of app. 5 mm. In every separate sample plant part content of dry matter was measured. By qualitative analysis was determined the content of crude proteins, crude fats, crude cellulose and crude ash, and the values of BEM and metabolic net energy were calculated. Besides, additionally were conducted measurements of: plant height, stalk thickness, cob height, plants number, yield per hectare, moving speed, cut height, time duration of trailer loading, trailer weight and harvester efficiency. Apart of those, losses of chopped material during the trailer loading were measured. Examined maize hybrids contained, in the stalk up to the height of 20 cm, 83,34% moisture and less metabolic energy, only 1,47 MJ/kg, compared to the rest of the plant with 3,53 MJ/kg. High correlation dependency between moving speed and cutting height was found. It was concluded that, during the harvesting, is not necessary to limit the working speed because of losses caused by increased cutting height. Increased cutting height from 12 to 20 cm would cause increment of the working speed, mass flow and harvester efficiency. Transport trailers must have large volume of transport space because of lower transport and loading losses. The chopping length that harvester achieved has fulfilled the technological requirements.
AB  - U radu su prikazani rezultati kvantitativne i kvalitativne analize biljaka zastupljenih hibrida kukuruza. Biljke kukuruza za kvantitativnu i kvalitativnu analizu su ručno odsecane i usitnjavane na oko 5 mm. U svakom od navedenih delova uzorka određen je sadržaj suvih materija. Kvalitativnom analizom određivan je sadržaj sirovih proteina, sirovih masti, sirove celuloze i sirovog pepela, a računskim putem određene su vrednosti za BEM i metabolička neto energija. Pored toga izvršena su još i merenja: visine biljaka, debljine stabla, visina klipa, broj biljaka, prinos po hektaru, brzina kretanja, visina reza, vreme utovara prikolice, težina prikolice, propusna moć i učinak kombajna. Posebno su mereni gubici iseckane mase pri utovaru u transportno sredstvo. Ispitivani hibridi kukuruza u stablu do visine od 20 cm sadrže 83,34% vlage i najmanje neto metaboličke energije, svega 1,47 MJ/kg u odnosu na ostali deo biljke sa 3,53 MJ/kg. Postoji visoka korelaciona zavisnost između brzine kretanja i visine reza. Zaključeno je da kombajniranjem ne treba ograničavati radnu brzinu zbog gubitaka na povećanu visinu reza. Povećanje visine reza sa 12-20 cm povećala bi se radna brzina, protok mase i učinak kombajna. Transportna sredstva moraju imati veliku zapreminu utovarnog prostora jer su manji gubici pri utovaru i transportu. Ostvarenom dužinom seckanja kombajn je zadovoljio tehnološke zahteve.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Work quality of silage harvester Fortshritte-286
T1  - Kvalitet rada silažnog kombajna Fortshritte-286
EP  - 17
IS  - 3
SP  - 11
VL  - 33
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_1737
ER  - 

@article{
author = "Stanimirović, Nebojša and Koprivica, Ranko and Veljković, Biljana and Topisirović, Goran",
year = "2008",
abstract = "Results of quantitative and qualitative maize plants analysis were presented in the paper. Analyzed maize plants were cut and chopped by hand, into pieces of app. 5 mm. In every separate sample plant part content of dry matter was measured. By qualitative analysis was determined the content of crude proteins, crude fats, crude cellulose and crude ash, and the values of BEM and metabolic net energy were calculated. Besides, additionally were conducted measurements of: plant height, stalk thickness, cob height, plants number, yield per hectare, moving speed, cut height, time duration of trailer loading, trailer weight and harvester efficiency. Apart of those, losses of chopped material during the trailer loading were measured. Examined maize hybrids contained, in the stalk up to the height of 20 cm, 83,34% moisture and less metabolic energy, only 1,47 MJ/kg, compared to the rest of the plant with 3,53 MJ/kg. High correlation dependency between moving speed and cutting height was found. It was concluded that, during the harvesting, is not necessary to limit the working speed because of losses caused by increased cutting height. Increased cutting height from 12 to 20 cm would cause increment of the working speed, mass flow and harvester efficiency. Transport trailers must have large volume of transport space because of lower transport and loading losses. The chopping length that harvester achieved has fulfilled the technological requirements., U radu su prikazani rezultati kvantitativne i kvalitativne analize biljaka zastupljenih hibrida kukuruza. Biljke kukuruza za kvantitativnu i kvalitativnu analizu su ručno odsecane i usitnjavane na oko 5 mm. U svakom od navedenih delova uzorka određen je sadržaj suvih materija. Kvalitativnom analizom određivan je sadržaj sirovih proteina, sirovih masti, sirove celuloze i sirovog pepela, a računskim putem određene su vrednosti za BEM i metabolička neto energija. Pored toga izvršena su još i merenja: visine biljaka, debljine stabla, visina klipa, broj biljaka, prinos po hektaru, brzina kretanja, visina reza, vreme utovara prikolice, težina prikolice, propusna moć i učinak kombajna. Posebno su mereni gubici iseckane mase pri utovaru u transportno sredstvo. Ispitivani hibridi kukuruza u stablu do visine od 20 cm sadrže 83,34% vlage i najmanje neto metaboličke energije, svega 1,47 MJ/kg u odnosu na ostali deo biljke sa 3,53 MJ/kg. Postoji visoka korelaciona zavisnost između brzine kretanja i visine reza. Zaključeno je da kombajniranjem ne treba ograničavati radnu brzinu zbog gubitaka na povećanu visinu reza. Povećanje visine reza sa 12-20 cm povećala bi se radna brzina, protok mase i učinak kombajna. Transportna sredstva moraju imati veliku zapreminu utovarnog prostora jer su manji gubici pri utovaru i transportu. Ostvarenom dužinom seckanja kombajn je zadovoljio tehnološke zahteve.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Work quality of silage harvester Fortshritte-286, Kvalitet rada silažnog kombajna Fortshritte-286",
pages = "17-11",
number = "3",
volume = "33",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_1737"
}

Stanimirović, N., Koprivica, R., Veljković, B.,& Topisirović, G.. (2008). Work quality of silage harvester Fortshritte-286. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 33(3), 11-17.
https://hdl.handle.net/21.15107/rcub_agrospace_1737

Stanimirović N, Koprivica R, Veljković B, Topisirović G. Work quality of silage harvester Fortshritte-286. in Poljoprivredna tehnika. 2008;33(3):11-17.
https://hdl.handle.net/21.15107/rcub_agrospace_1737 .

Stanimirović, Nebojša, Koprivica, Ranko, Veljković, Biljana, Topisirović, Goran, "Work quality of silage harvester Fortshritte-286" in Poljoprivredna tehnika, 33, no. 3 (2008):11-17,
https://hdl.handle.net/21.15107/rcub_agrospace_1737 .

TY  - JOUR
AU  - Topisirović, Goran
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Stanimirović, Nebojša
PY  - 2007
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1431
AB  - The paper presents results of activities for improving feed preparation practices in some parts of Western Serbia characterized by highly extensive livestock production. Main improvements were achieved by farmer education and introduction of a number of specialized machines for use in upland regions. The machinery was specialized for bale grass ensilage. For this purpose, six groups of farmers were established in the region. Trained and authorized for operating the machinery, the farmers were obliged to properly use and maintain it, as well as to train other farmers. The investigations covered a line of grass ensilage machines, being as follows: a rotary mower a rotary hay collector, a roll baler and a silage bale wrapper. The study results refer to transport time, effective work hours, total work hours performance etc. The paper presents the results of monitoring the performance of the machines and the farmer groups during the first operating season. Enlargement of the initially formed groups is further expected to take place through further farmer involvement, along with the registration of machinery rings and the achievement of their full sustainability and work independence.
AB  - U radu su prikazani rezultati aktivnosti koje su preduzete u nekim delovima zapadne Srbije, sa izrazito ekstenzivnom stočarskom proizvodnjom, na unapređenju mera i postupaka pripreme stočne hrane. Unapređenja su postignuta edukacijom farmera i uvođenjem u primenu većeg broja mašina namenjenih za rad u brdsko-planinskom području. Mašine su namenjene za uvođenje postupak pripreme travne silaže u balama. Za tu svrhu je u regionu osnovano šest grupa farmera koji su, kao obučeni i ovlašćeni rukovaoci, prihvatili obavezu primene mašina, pravilne eksploatacije i održavanja, kao i obuke drugih farmera za rad. Ispitivanjima je obuhvaćena linija mašina za spremanje travne silaže i to: rotaciona kosačica, rotacioni sakupljač sena, rol baler i omotač bala u foliju. Rezultati ispitivanja se odnose na vreme transporta, efektivno radno vreme, ukupno radno vreme, učinak i dr. Ovde su prikazani rezultati praćenja rada mašina i grupa farmera tokom prve sezone primene. Nakon ovoga se očekuje proširenje postojećih grupa daljim ulaganjem samih farmera registrovanje mašinskih prstenova i postizanje održivosti i samostalnosti rada uduženja.
PB  - Institut za ratarstvo i povrtarstvo, Novi Sad
T2  - Zbornik radova Instituta za ratarstvo i povrtarstvo
T1  - First results of machinery ring establishment and ensilage machine use in an upland region
T1  - Prvi rezultati osnivanja mašinskih prstemova i primene mašina za pripremu travne silaže u brdsko-planinskom području
EP  - 555
IS  - 1
SP  - 547
VL  - 44
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_1431
ER  - 

@article{
author = "Topisirović, Goran and Koprivica, Ranko and Radivojević, Dušan and Stanimirović, Nebojša",
year = "2007",
abstract = "The paper presents results of activities for improving feed preparation practices in some parts of Western Serbia characterized by highly extensive livestock production. Main improvements were achieved by farmer education and introduction of a number of specialized machines for use in upland regions. The machinery was specialized for bale grass ensilage. For this purpose, six groups of farmers were established in the region. Trained and authorized for operating the machinery, the farmers were obliged to properly use and maintain it, as well as to train other farmers. The investigations covered a line of grass ensilage machines, being as follows: a rotary mower a rotary hay collector, a roll baler and a silage bale wrapper. The study results refer to transport time, effective work hours, total work hours performance etc. The paper presents the results of monitoring the performance of the machines and the farmer groups during the first operating season. Enlargement of the initially formed groups is further expected to take place through further farmer involvement, along with the registration of machinery rings and the achievement of their full sustainability and work independence., U radu su prikazani rezultati aktivnosti koje su preduzete u nekim delovima zapadne Srbije, sa izrazito ekstenzivnom stočarskom proizvodnjom, na unapređenju mera i postupaka pripreme stočne hrane. Unapređenja su postignuta edukacijom farmera i uvođenjem u primenu većeg broja mašina namenjenih za rad u brdsko-planinskom području. Mašine su namenjene za uvođenje postupak pripreme travne silaže u balama. Za tu svrhu je u regionu osnovano šest grupa farmera koji su, kao obučeni i ovlašćeni rukovaoci, prihvatili obavezu primene mašina, pravilne eksploatacije i održavanja, kao i obuke drugih farmera za rad. Ispitivanjima je obuhvaćena linija mašina za spremanje travne silaže i to: rotaciona kosačica, rotacioni sakupljač sena, rol baler i omotač bala u foliju. Rezultati ispitivanja se odnose na vreme transporta, efektivno radno vreme, ukupno radno vreme, učinak i dr. Ovde su prikazani rezultati praćenja rada mašina i grupa farmera tokom prve sezone primene. Nakon ovoga se očekuje proširenje postojećih grupa daljim ulaganjem samih farmera registrovanje mašinskih prstenova i postizanje održivosti i samostalnosti rada uduženja.",
publisher = "Institut za ratarstvo i povrtarstvo, Novi Sad",
journal = "Zbornik radova Instituta za ratarstvo i povrtarstvo",
title = "First results of machinery ring establishment and ensilage machine use in an upland region, Prvi rezultati osnivanja mašinskih prstemova i primene mašina za pripremu travne silaže u brdsko-planinskom području",
pages = "555-547",
number = "1",
volume = "44",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_1431"
}

Topisirović, G., Koprivica, R., Radivojević, D.,& Stanimirović, N.. (2007). First results of machinery ring establishment and ensilage machine use in an upland region. in Zbornik radova Instituta za ratarstvo i povrtarstvo
Institut za ratarstvo i povrtarstvo, Novi Sad., 44(1), 547-555.
https://hdl.handle.net/21.15107/rcub_agrospace_1431

Topisirović G, Koprivica R, Radivojević D, Stanimirović N. First results of machinery ring establishment and ensilage machine use in an upland region. in Zbornik radova Instituta za ratarstvo i povrtarstvo. 2007;44(1):547-555.
https://hdl.handle.net/21.15107/rcub_agrospace_1431 .

Topisirović, Goran, Koprivica, Ranko, Radivojević, Dušan, Stanimirović, Nebojša, "First results of machinery ring establishment and ensilage machine use in an upland region" in Zbornik radova Instituta za ratarstvo i povrtarstvo, 44, no. 1 (2007):547-555,
https://hdl.handle.net/21.15107/rcub_agrospace_1431 .

TY  - JOUR
AU  - Živković, M.
AU  - Kosi, Franc F.
AU  - Koprivica, Ranko
PY  - 2006
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1175
AB  - The paper presents the study results on technical and technological parameters in the process of low-temperature drying of stone fruit (plum and apricot) under both laboratory conditions and in a multi-purpose prototype dryer intended for plant material drying. The experimental investigations comprised flow and thermal measurements, technological and kinetic drying parameters. Major emphasis was on temperature and relative humidity of the drying agent and moisture and temperature of the dried material, as well as the drying rate. According to the results obtained, the preheating period was 2-3 hours depending on the type of the material and the drying regime i.e. on the condition of the drying agent. Maximum plum drying rate was recorded 2 h after the beginning of the process and amounted to about 1.15 kg w/kg d.b.h. In the case of apricot drying, maximum drying rate was approx. 0.45 kgw/kg d.b.h. and was registered only 4 hours after the beginning of the drying process, which differed from the plum drying rate under approximately equal drying regime. In addition, the apricot drying kinetics curve differed in shape from the plum drying kinetics curve. The obtained quality of both dried fruits under low-temperature drying conditions was found to meet standard requirements to a great extent primarily respecting sugar and acid loss and the fact that there was no odor or contamination of the fruit. The results obtained showed that, in addition to the technical designs of the drying system, the fruit drying process was found to be significantly affected by how the process itself the duration of which could be reduced, was being managed.
AB  - U radu su prikazani rezultati istraživanja tehničko tehnoloških parametara procesa niskotemperatuskog sušenja plodova koštičavog voća (šljiva i kajsija). Eksperimentalna istraživanja sprovedena na laboratorijskoj instalaciji i na prototipskoj univerzalnoj sušari namenjenoj za sušenje biljnih materijala, obuhvatila su strujnotermička merenja, parametre kinetike procesa i tehnološke parametre sušenja. Posebno su analizirani temperatura i relativna vlažnost agensa sušenja, vlažnost i temperatura materijala za sušenje kao i brzina sušenja. Rezultati pokazuju da period pregrevanja materijala iznosi od 2-3 h, što je uslovljeno vrstom materijala i režimom sušenja tj. stanjem agensa sušenja. Maksimalna brzina sušenja plodova šljive nastaje nakon 2 h i iznosi oko 1,15 kg w/kg s.m.h. Kod sušenja plodova kajsija maksimalna brzina sušenja iznosi približno 0,45 kgw/kg s.m.h. i pojavljuje se tek nakon 4 časa od početka procesa u čemu se razlikuje od brzine sušenje plodova šljive za približno isti režim sušenja. Pored toga, kriva kinetike sušenja kajsija ima drugačiji oblik u odnosu na krivu sušenja šljiva. Ostvaren kvalitet obe vrste osušenih plodova sa navedenim niskotemperaturskim režimima u velikoj meri odgovara standardima pre svega u pogledu gubitka šećera i kiselina, kao i odsustva bilo kakvih mirisa i zagađenosti plodova. Dobijeni rezultati ukazuju da, pored tehničkih rešenja sistema za sušenje, na uspeh procesa značajan uticaj ima i samo vođenje procesa čije se trajanje može redukovati.
PB  - Univerzitet u Kragujevcu - Agronomski fakultet, Čačak
T2  - Acta agriculturae Serbica
T1  - Stone fruit drying parameters
T1  - Parametri sušenja koštičavog voća
EP  - 14
IS  - 22
SP  - 3
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_1175
ER  - 

@article{
author = "Živković, M. and Kosi, Franc F. and Koprivica, Ranko",
year = "2006",
abstract = "The paper presents the study results on technical and technological parameters in the process of low-temperature drying of stone fruit (plum and apricot) under both laboratory conditions and in a multi-purpose prototype dryer intended for plant material drying. The experimental investigations comprised flow and thermal measurements, technological and kinetic drying parameters. Major emphasis was on temperature and relative humidity of the drying agent and moisture and temperature of the dried material, as well as the drying rate. According to the results obtained, the preheating period was 2-3 hours depending on the type of the material and the drying regime i.e. on the condition of the drying agent. Maximum plum drying rate was recorded 2 h after the beginning of the process and amounted to about 1.15 kg w/kg d.b.h. In the case of apricot drying, maximum drying rate was approx. 0.45 kgw/kg d.b.h. and was registered only 4 hours after the beginning of the drying process, which differed from the plum drying rate under approximately equal drying regime. In addition, the apricot drying kinetics curve differed in shape from the plum drying kinetics curve. The obtained quality of both dried fruits under low-temperature drying conditions was found to meet standard requirements to a great extent primarily respecting sugar and acid loss and the fact that there was no odor or contamination of the fruit. The results obtained showed that, in addition to the technical designs of the drying system, the fruit drying process was found to be significantly affected by how the process itself the duration of which could be reduced, was being managed., U radu su prikazani rezultati istraživanja tehničko tehnoloških parametara procesa niskotemperatuskog sušenja plodova koštičavog voća (šljiva i kajsija). Eksperimentalna istraživanja sprovedena na laboratorijskoj instalaciji i na prototipskoj univerzalnoj sušari namenjenoj za sušenje biljnih materijala, obuhvatila su strujnotermička merenja, parametre kinetike procesa i tehnološke parametre sušenja. Posebno su analizirani temperatura i relativna vlažnost agensa sušenja, vlažnost i temperatura materijala za sušenje kao i brzina sušenja. Rezultati pokazuju da period pregrevanja materijala iznosi od 2-3 h, što je uslovljeno vrstom materijala i režimom sušenja tj. stanjem agensa sušenja. Maksimalna brzina sušenja plodova šljive nastaje nakon 2 h i iznosi oko 1,15 kg w/kg s.m.h. Kod sušenja plodova kajsija maksimalna brzina sušenja iznosi približno 0,45 kgw/kg s.m.h. i pojavljuje se tek nakon 4 časa od početka procesa u čemu se razlikuje od brzine sušenje plodova šljive za približno isti režim sušenja. Pored toga, kriva kinetike sušenja kajsija ima drugačiji oblik u odnosu na krivu sušenja šljiva. Ostvaren kvalitet obe vrste osušenih plodova sa navedenim niskotemperaturskim režimima u velikoj meri odgovara standardima pre svega u pogledu gubitka šećera i kiselina, kao i odsustva bilo kakvih mirisa i zagađenosti plodova. Dobijeni rezultati ukazuju da, pored tehničkih rešenja sistema za sušenje, na uspeh procesa značajan uticaj ima i samo vođenje procesa čije se trajanje može redukovati.",
publisher = "Univerzitet u Kragujevcu - Agronomski fakultet, Čačak",
journal = "Acta agriculturae Serbica",
title = "Stone fruit drying parameters, Parametri sušenja koštičavog voća",
pages = "14-3",
number = "22",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_1175"
}

Živković, M., Kosi, F. F.,& Koprivica, R.. (2006). Stone fruit drying parameters. in Acta agriculturae Serbica
Univerzitet u Kragujevcu - Agronomski fakultet, Čačak., 11(22), 3-14.
https://hdl.handle.net/21.15107/rcub_agrospace_1175

Živković M, Kosi FF, Koprivica R. Stone fruit drying parameters. in Acta agriculturae Serbica. 2006;11(22):3-14.
https://hdl.handle.net/21.15107/rcub_agrospace_1175 .

Živković, M., Kosi, Franc F., Koprivica, Ranko, "Stone fruit drying parameters" in Acta agriculturae Serbica, 11, no. 22 (2006):3-14,
https://hdl.handle.net/21.15107/rcub_agrospace_1175 .

TY  - JOUR
AU  - Topisirović, Goran
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
PY  - 2005
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1081
AB  - Results of activities on improvement of livestock feeds preparation practices in western Serbia region are presented in this paper. Main achievements are obtained by farmers education and introduction and involvement of specialized machinery for hilly regions in practice. Most of machinery was specialized for quick hay and grass silage preparation. For this purpose six groups of farmers were established. The farmers were trained and registered for operating machinery. They also were obliged to maintain and properly use machinery, as well as train other farmers. Results of these processes during the first year are presented. Enlargement of initially formed groups is expected, along with achievement of full sustainability of machinery rings further work.
AB  - U radu su prikazani rezultati aktivnosti koje su preduzete u nekim delovima zapadne Srbije, sa izrazilo ekstenzivnom stočarskom proizvodnjom, na unapređenju mera i postupaka pripreme stočne hrane. Unapređenja su postignuta edukacijom farmera i uvođenjem u primenu većeg broja mašina namenjenih za rad u brdsko-planinskom području. Mašine su namenjene za uvođenje postupaka brze pripreme sena i pripreme travne silaže u balama. Za tu svrhu je u regionu osnovano šest grupu farmera koji su, kao obučeni i ovlašćeni rukovaoci, prihvatili obavezu primene mašina, pravilne eksploatacije i održavanja, kao i obuke drugih farmera za rad. Ovde su prikazani rezultali praćenja rada mašina i grupa farmera tokom prve sezone primene. Nakon ovoga se očekuje proširenje postojećih grupa daljim ulaganjem samih farmera, registrovanje mašinskih prstenova i postizanje održivosti i samostalnosti rada udruženja.
PB  - Naučno društvo za pogonske mašine, traktore i održavanje, Novi Sad i Univerzitet u Novom Sadu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Novi Sad
T2  - Traktori i pogonske mašine
T1  - Results of machinery ring establishment and the use of machinery for hay preparation in an upland region
T1  - Rezultati osnivanja mašinskih prstenova i primene mašina za pripremu sena u brdsko-planinskom području
EP  - 212
IS  - 2
SP  - 206
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_1081
ER  - 

@article{
author = "Topisirović, Goran and Koprivica, Ranko and Radivojević, Dušan",
year = "2005",
abstract = "Results of activities on improvement of livestock feeds preparation practices in western Serbia region are presented in this paper. Main achievements are obtained by farmers education and introduction and involvement of specialized machinery for hilly regions in practice. Most of machinery was specialized for quick hay and grass silage preparation. For this purpose six groups of farmers were established. The farmers were trained and registered for operating machinery. They also were obliged to maintain and properly use machinery, as well as train other farmers. Results of these processes during the first year are presented. Enlargement of initially formed groups is expected, along with achievement of full sustainability of machinery rings further work., U radu su prikazani rezultati aktivnosti koje su preduzete u nekim delovima zapadne Srbije, sa izrazilo ekstenzivnom stočarskom proizvodnjom, na unapređenju mera i postupaka pripreme stočne hrane. Unapređenja su postignuta edukacijom farmera i uvođenjem u primenu većeg broja mašina namenjenih za rad u brdsko-planinskom području. Mašine su namenjene za uvođenje postupaka brze pripreme sena i pripreme travne silaže u balama. Za tu svrhu je u regionu osnovano šest grupu farmera koji su, kao obučeni i ovlašćeni rukovaoci, prihvatili obavezu primene mašina, pravilne eksploatacije i održavanja, kao i obuke drugih farmera za rad. Ovde su prikazani rezultali praćenja rada mašina i grupa farmera tokom prve sezone primene. Nakon ovoga se očekuje proširenje postojećih grupa daljim ulaganjem samih farmera, registrovanje mašinskih prstenova i postizanje održivosti i samostalnosti rada udruženja.",
publisher = "Naučno društvo za pogonske mašine, traktore i održavanje, Novi Sad i Univerzitet u Novom Sadu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Novi Sad",
journal = "Traktori i pogonske mašine",
title = "Results of machinery ring establishment and the use of machinery for hay preparation in an upland region, Rezultati osnivanja mašinskih prstenova i primene mašina za pripremu sena u brdsko-planinskom području",
pages = "212-206",
number = "2",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_1081"
}

Topisirović, G., Koprivica, R.,& Radivojević, D.. (2005). Results of machinery ring establishment and the use of machinery for hay preparation in an upland region. in Traktori i pogonske mašine
Naučno društvo za pogonske mašine, traktore i održavanje, Novi Sad i Univerzitet u Novom Sadu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Novi Sad., 10(2), 206-212.
https://hdl.handle.net/21.15107/rcub_agrospace_1081

Topisirović G, Koprivica R, Radivojević D. Results of machinery ring establishment and the use of machinery for hay preparation in an upland region. in Traktori i pogonske mašine. 2005;10(2):206-212.
https://hdl.handle.net/21.15107/rcub_agrospace_1081 .

Topisirović, Goran, Koprivica, Ranko, Radivojević, Dušan, "Results of machinery ring establishment and the use of machinery for hay preparation in an upland region" in Traktori i pogonske mašine, 10, no. 2 (2005):206-212,
https://hdl.handle.net/21.15107/rcub_agrospace_1081 .