Operating parameters of dragged combines 'Volentieri VG 2000/2TA' for grapevine harvesting

Abstract

Harvesting represents one of the most challenging problems in managing vineyards. 'Quality picking' is considered when it is done in the period when the grapes are suitable for its purposes, especially related with the soluble solid content, and the appropriate sugar/acids relation. Hand picking costs represent around 45% of total labor per hectare, which is equivalent of 30-50 working days for one laborer. Study of the mechanical picking of grapevine cultivars intended for winemaking by applying dragged combine 'Volentieri' ensemble with tractor 'New Holland Tn 95 F' are shown in this paper. Experiment was done in the Ćemovsko Field's production vineyards, with cultivars Vranac and Župljanka. Grapevine planting was done on the planting distance 2.6 x 0.7 m and 2.6 x 1 m, respectively. Row length was 168 m, with training system modified horizontal bilateral cordon with green strip width in grape area 50-60 cm. Aggregate's working results of the investigation are showing that average running speed was 4.8 km/h, and output 0.62 ha/h, i.e. 4.98 ha/day in cultivar Vranac. In cultivar Župljanka following values were achieved: running speed was 4.1 km/h, output 0.53 ha/h i.e. 4.24 ha/day. Turning time in headlands of examined harvester was 30 - 32 s. It was necessary to reduce green leaves just before harvesting, especially in the zone bunches, in order to decrease slowdowns and losses. Dragged combines, except in larger plantations, have commercial adequacy both in smaller households.

Jedan od najsloženijih problema u obavljanju radnih operacija u vinogradarstvu predstavlja proces berbe grožđa. Kvalitetna berba se smatra ona koja se obavi u periodu kada sastav grožđa odgovara njegovoj nameni, što se pre svega odnosi na suvu materiju i odgovarajući odnos šećera i kiselina. Troškovi ručne berbe grožđa čine oko 45% od ukupnog utroška ljudskog rada po hektaru što odgovara 30-50 radnih dana jednog radnika. U radu su prikazani rezultati ispitivanja mehanizovane berbe vinskih sorti grožđa, primjenom vučenog kombajna 'Volentieri' u agregatu s traktorom 'New Holland Tn 95 F'. Ispitivanja su obavljena na proizvodnim površinama Ćemovskog polja, sorte Vranac i Župljanka. Sadnja loze je obavljena na međurednom i rednom rastojanju 2,6 x 0,7 m i 2,6 x 1 m. Dužina redova je iznosila 168 m a zastupljen uzgojni sistem je modifikovana horizontalna dvokraka kordunica sa širinom zelenog pojasa u zoni grožđa 50-60 cm. Rezultati ispitivanja agregata u radu pokazuju da je ostvarena prosječna radna brzina od 4,8 km/h, a učinak 0,62 ha/h tj. 4,98 ha/dan - sorta Vranac. Kod sorte Župljanka ostvarene su vrednosti: brzina rada 4,1 km/h, učinak 0,53 ha/h tj. 4,24 ha/dan. Pri radu kombajna javljaju se gubici od 36 kg/ha kod sorte Vranac, a 70 kg/ha kod sorte Župljanka. Vreme okretanja na uvratinama ispitivanog kombajna je iznosilo 30 -32 s. Neposredno pred berbu neophodno je zelenom rezidbom smanjiti lisnu masu posebno u zoni grožđa kako bi se smanjili zastoji u berbi i gubici. Vučeni kombajni, osim u većim plantažnim zasadima imaju ekonomsku opravdanost i na manjim posjedima.