Maize response to nitrogen fertilization on conservation soil tillage

Istraţivanja reakcije kukuruza na gnojidbu dušikom pri konzervacijskoj obradi tla provedena su tijekom tehnološke 2012./2013. na hidromorfnim tipovima tala na dvije lokacije: u Čačincima (GPS: Long. 17.86336 E; Lat. 45.61316 N) i u blizini mjesta Magadenovci (GPS: Long. 18.70648 E; Lat. 45.55555 N). Istraţivanjima su obuhvaćene tri razine gnojidbe dušikom na tri različita konzervacijska sustava obrade tla. N1 razina gnojidbe bila je umanjena za 30 % u odnosu na gnojidbenu preporuku, N2 razina gnojidbe bila je primjenjena prema gnojidbenoj preporuci, dok je N3 razina gnojidbe bila uvećana za 30 % u odnosu na gnojidbenu preporuku. Konzervacijski sustavi obrade tla bili su: PO- podrivanje, RA- rahljenje i DS- direktna sjetva. Prema dobivenim podacima, razina gnojidbe dušikom i specifičnost lokaliteta su statistički značajno utjecali na gotovo sve ispitivane parametre (visinu biljke, masu biljke, masu klipa, masu zrna na klipu, biološki i poljoprivredni prinos). Tretman konzervacijske obrade imao je značajan utjecaj na sve parameter osim na na visinu biljke, hektolitarsku masu i masu 1000 zrna. Hektolitarska masa i masa 1000 zrna nisu bile pod značajnim utjecajem niti jednog tretmana. Najveći prinosi ostvareni su na lokaciji Magadenovac (biološki prinos iznosio je 49,1 t ha-1, a poljoprivredni prinos 12,8 t ha-1), na tretmanima podrivanja (biološki prinos - 45,1 t ha-1, poljoprivredni prinos - 12,1 t ha-1) i na tretmanima gnojidbe prema preporuci (biološki prinos - 43,7 t ha-1, poljoprivredni prinos - 11,6 t ha-1).Investigation of maize reaction on nitrogen fertilization under conservation soil tillage were carried out during the 2012/2013 year on hydromorphic soil types on two locations: Čačinci (GPS: Long. 17.86336 E; Lat. 45.61316 N) and near Magadenovci (GPS: Long. 18.70648 E; Lat. 45.55555 N). The field experiments included three levels of nitrogen fertilization on three different conservation soil tillage treatments. N1 level of fertilization was 30% lower compared to fertilization recommendation, N2 level of fertilization was equal to fertilizer recommendation and N3 level of fertilization was 30% higher compared to fertilization recommendation. Conservation soil tillage systems was of: PO- subsoiling, RA- chiselling and DS- direct seeding. According to the data, the level of nitrogen fertilization and specific locations were significantly impacted almost all tested parameters (plant height, plant weight, weight of cob, grain weight per cob, biological and agricultural yield). Conservation tillage treatment had a significant effect on all parameters except at the height of the plants, hectoliter weight and mass of 1000 grains. There were not found any statistically significant impacts of treatments on hectoliter weight and mass of 1000 grains. The largest agricultural and biological maize yields were achieved on location near Magadenovci (biological yield was 49.1 t ha-1 and agricultural yield was 12.8 t ha-1), on subsoiling soil tillage treatments (biological yield was 45.1 t ha-1 and agricultural yield was 12.1 t ha-1) and on the fertilization treatment according to recommendation (biological yield was 43.7 t ha-1 and agricultural yield was 11.6 t ha-1)