The effect of injection application of ammonium ferti lizer on the yield of maize*

The effect of plant nitrogen nutrition by CULTAN (Controlled Uptake Long Term Ammonium Nutrition) method on the yield of maize and the content of nitrogen in various evolution phases was being observed in a field experiment carried out in the years 2010–2011. The experiment took place at three stations with different soilclimatic conditions. CULTAN variants were fertilized with a one-off total dose of nitrogen (by the means of a injection machine, to the depth of 5 cm in the soil) and compared with conventional fertilization, when Calcium Ammonium Nitrate was spread in a blanket manner on the soil’s surface. In one injection variant nitrogenous fertilizer containing sulphur (Urea Ammonium Sulphate) was observed. The same dose of nitrogen 140 kg N.ha-1 was applied in all variants. In 2011 the biggest grain yield was achieved at Hn?v?eves, where all CULTAN variants proved better yield than the conventional variant (15,03 t.ha-1). Statistically significant bigger grain yield was observed by injection variant Urea Ammonium Nitrate + inhibitors of nitrification variant, in comparison with the conventional variant by 15,5%. In Hn?v?eves there was a tendency to getti ng better straw yield by CULTAN variants in 2010.