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Pseudogley plasticity in South Mačva

Plastičnost pseudogleja južne Mačve

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Dugonjić, Mladen
Djordjević, Aleksandar
Cupać, Svjetlana
Tomić, Zorica
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Abstract
Atterberg plastic limit was determined in topsoil (Ahp) and subsoil (Eg, gBt and Btg) horizons of pseudogley in South Mačva, as well as the contents of humus, clay ( lt 0.002 mm), and colloidal activity index (lea). The results of Atterberg plastic limits, taking into account all depths of the profiles under study, showed that the values of upper plastic limits (Wl) varied in a rather wide interval, from 33.28 to 57.88%, and the values of the lower plastic limits (Wp) varied in a considerably narrower interval from 18.04 to 22.82 %. The calculated plasticity index (Ip) varied from 15.24 to 36.70 which, according to Liberoth (1969) classification, characterises moderately to very plastic soils. A very strong correlation coefficient (r - 0.833) between Ip and the clay content ( lt 0.002 mm) indicates that the particle-size distribution, i.e. the clay content, had the decisive effect on the value of plasticity index. High values of plasticity index in the majority of pseudogley profiles... in South Mačva are undesirable characteristics from the aspect of tillage and crop yield.

U radu su prikazani rezultati određivanja Atterberg-ovih granica plastičnosti u površinskom (Ahp) i podpovršinskim (Eg, gBt i Btg) horizontiraa pseudogleja južne Mačve, kao i rezultati određivanja sadržaja humusa, gline ( lt 0,002 mm) i indeksa koloidne aktivnosti (Ica). Rezultati određivanja Atterberg-ovih granica plastičnosti, uzimajući u obzir sve dubine analiziranih profila, pokazali su da vrednosti gornje granice plastičnosti (Wl) variraju u prilično širokom intervalu, od 33,28-57,88%, dok su vrednosti donje granice plastičnosti (Wp) varilale u znatno užem intervalu, od 18,04-22,82 % Izračunati indeks plastičnosti( Ip) varirao je u intervalu od 15,24-36,70, što je prema klasifikaciji Lieberoth-a (1969) karakteristično za umereno do jako plastična zemljišta. Vrlo jak korelacioni koeficijent (r = 0,833) postignut između Ip i sadržaja gline ( lt 0,002mm) ukazuje, da je mehanički sastav,odnosno sadržaj gline u odlučujućem stepenu uticao na veličinu indeksa plastičnosti. Visoke vredn...osti indeksa plastičnosti u većini profila pseudogleja južne Mačve nepoželjna su karakteristika sa aspekta njihove obrade i gajenja biljaka na njima.

Keywords:
pseudogley / Atterberg plastic limits / plasticity index
Source:
Zemljište i biljka, 2008, 57, 3, 111-117
Publisher:
  • Unija bioloških naučnih društava Jugoslavije, Beograd

ISSN: 0514-6658

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Handle
https://hdl.handle.net/21.15107/rcub_agrospace_1655
URI
http://aspace.agrif.bg.ac.rs/handle/123456789/1655
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