Efficiency of mechanised collection of soybean straw

Značaj soje proizlazi iz kakvoće njenog zrna (visok sadržaj bjelančevina i ulja), pa je jedna od najznačajnijih bjelančevinastih i uljnih kultura u svijetu. Sojina slama predstavlja važan izvor organske tvari te ima važan utjecaj na biološka, kemijska i fizikalna svojstva tla i ne treba ih smatrati otpadom. Biomasa poljoprivrednoga porijekla, pa tako i slama soje, vrlo je prihvatljivo gorivo s gledišta utjecaja na okoliš. Cilj ovog rada je utvrditi stvarne količine prikupljene slame nakon žetve soje korištenjem postojeće mehanizacije, prešom za valjkaste bale s pick-up uređajem. Poljski pokus proveden je na lokaciji u Velikoj Barni s tri sorte soje, Lucijom, Galinom i Ikom, zastupljenima u plodoredu kod domaćih poljoprivrednika. Učinkovitost baliranja razlikovala se između sorata i iznosila je od 33,3 % kod sorte Ika do 48,9 % kod sorte Lucija. Količina žetvenih ostataka koji će se moći prikupiti ovisi sadržaju vode u slami u trenutku baliranja, te konstrukciji kombajna i balirke.The importance of soybean comes from the quality of its grain (high protein and oil content), so it is one of the most important protein and oil crops in the world. Straw is an important source of organic matter and have important influence on the biological, chemical and physical properties of the soil and should not be considered as waste. Biomass of agricultural origin, like soy straw, is highly acceptable energy source from the environmental point of view. The aim of this paper is to determine the actual amounts of straw collected after harvesting soybean using existing mechanization, round baler with pick-up. The field experiment was set at location in Velika Barna with three soy varieties, Lucija, Galina and Ika, represented in the crop rotation by domestic farmers. Baling efficiency differed between soybean varieties and ranged from 33.3% for Ika to 48.9% for Lucija. The amount collected of post-harvest residues depended on the water content of the straw at the time of baling and the construction of combine and baler