Influence of conservation tillage and nitrogen fertilization on chemical composition of maize grain

Istraživanja utjecaja konzervacijske obrade tla i gnojidbe dušikom na kemijski sastav zrna kukuruza provedena su tijekom tehnološke 2012./2013. na hidromorfnim tipovima tala na dvije lokacije: Čačincima i Magadenovcu. Istraživanjima su obuhvaćene tri razine gnojidbe dušikom (reducirana – N1, optimalna – N2 i luksuzna gnojidba – N3) na pet različitih sustava obrade tla (CT – konvencionalna obrada tla oranjem, SS – podrivanje, CH – rahljenje, DH – tanjuranje, NT – direktna sjetva). Prema rezultatima istraživanja, obrada tla i razina gnojdbe dušikom značajno su utjecale na kemijski sastav zrna kukuruza. Primjena konzervacijske obrade imala je najveći učinak na sadržaj škroba, celuloze i ulja, dok je konvencionalna obrada najviše utjecala na sadržaj proteina. Optimalnom gnojidbom dušikom ostvareni su najveće vrijednosti gotovo svih parametara (škroba, proteina i celuloze) u zrnu kukuruza.Investigation of influence of conservation soil tillage and nitrogen fertilization on chemical composition of maize grain were carried out during the 2012/2013 year on hydromorphic soil types on two locations: Čačinci and Magadenovac. The field experiments included three levels of nitrogen fertilization (reduced fertilization – N1, optimal fertilization – N2, luxury fertilization – N3) on five different soil tillage systems (CT – conventional soil tillage with ploughing, SS – subsoiling, CH – chiselling, DH – diskharrowing, NT – no-tillage). According to research finding, soil tillage and level of nitrogen fertilization have a significant influence on chemical composition of maize grain. Conservation soil tillage had the highest influence on starch, cellulose and oil content, while conventional tillage had the highest influence on protein content. Optimal fertilization with nitrogen has recorded the highest values of almost all parameters (starch, protein and cellulose) in a maize grain