University of Zagreb. Faculty of Agriculture. Department of Agricultural Engineering.
Abstract
Cilj istraživanja bio je utvrditi optimalnu brzinu kretanja sijaćeg agregata obzirom na radni učinak i kvalitetu sjetve: razmak između redova i razmak unutar reda. Istraživanje je provedeno na dva tipa pneumatskih sijačica (s podtlakom i s nadtlakom) pri tri brzine kretanja (6, 8 i 10 km/h). Nakon sjetve utvrđeno je da sijačica sa podtlakom pri brzini od 6,24 km/h imala 100%-tnu točnost, a pri većim brzinama sjetve javljaju se odstupanja u vrlo malom postotku. U sjetvi sa sijačicom s nadtlakom, povećanjem brzine kretanja sijačice s nadtlakom, došlo je do značajnog smanjenja kvalitete sjetve. Obzirom na učinak agregata povećanje brzine kretanja opravdano je kod sijačice sa principom rada na podtlak zbog toga što povećanjem brzine dolazi do vrlo malih odstupanja u zadanom sklopu i malog smanjenja kvalitete sjetve prema ISO 7256.The aim of this research was to determine the optimal working speed air seed drill regarding work rate and seed distribution: space between rows and space within rows. The research was conducted with two types of pneumatic sowing machines (with overpressure and with vacuum metering system) at three working speeds (6, 8 and 10 km/h). After sowing it was determined that the sowing machine with vacuum metering system at the speed of 6,24 km/h had 100 % accuracy, and at higher speeds minor deviations occurred. In sowing with the sowing machine with overpressure system, increasing the working speed resulted with a major decrease of seed distribution quality. Given the work rate of the sowing aggregate, the increase of the working speed is justified in the case of vacuum type pneumatic seed drill because the increase in speed results in minor deviations in sowing rates and seeding quality according to ISO 7256
