Maize productivity under conservation soil tillage and nitrogen fertilization

Istraživanje produktivnosti kukuruza pri konzervacijskoj obradi tla i različitim dozama dušika provedeno je tijekom 2013. godine na hidromorfnom tipu tla u blizini mjesta Magadenovac (GPS: Long. 18.70648 E; Lat. 45.55555 N). Istraživanje je obuhvaćalo pet različitih sustava obrade tla, od kojih je jedna bila konvencionalna obrada oranjem (CT), a ostale su pripadale konzervacijskim sustavima obrade tla (rahljenje - SS, podrivanje - CH, tanjuranje - DH i direktna sjetva - NT) i tri razine gnojidbe dušikom: N1 - reducirana (gnojidba umanjena za 30 % u odnosu na gnojidbenu preporuku), N2 - optimalna (prema gnojidbenoj preporuci) i N3 - luksuzna gnojidba (gnojidba uvećana za 30 % u odnosu na gnojidbenu preporuku). Prema dobivenim podacima, tretman obrade tla i razina gnojidbe dušikom imali su značajan utjecaj na gotovo sve ispitivane parametre, osim na hektolitarsku masu i žetveni indeks. Najveću produktivnost imao je kukuruz na tretmanu podrivanja uz optimalnu gnojidbu dušikom. Svi ostali tretmani obrade tla dali su zadovoljavajuće rezultate izuzev direktne sjetve tretmana.The research of maize productivity under conservation soil tillage and nitrogen fertilization was conducted in 2013 on a hydromorphic soil near Magadenovac (GPS: Long. 18.70648 E; Lat. 45.55555 N). The research included five different tillage systems, one of them was conventional tillage (CT), while the others belonged to conservation soil tillage systems (subsoiling – SS, chiseling - CH, , disk harrowing - DH, and direct seeding - NT) and three different levels of nitrogen fertilization: N1 - reduced (fertilization reduced by 30% compared to fertilization recommendation), N2 - optimal recommended fertilization (according to fertilization recommendation and N3 - luxurious fertilization (fertilization increased by 30% compared to fertilization recommendation). According to the obtained data, soil tillage treatments and level of nitrogen fertilization had significant impact on almost every tested parameter, except for hectoliter weight and harvest index. Subsoiling tillage and optimal fertilization resulted with highest maize productivity. All conservation soil tillage systems recorded satisfying results, except direct seeding