Use of stabilised urea in winter oilseed rape nutrition-3-years results

At the Research Station of FAFNR CULS at the locality Cerveny Ujezd, we have completed the third year of experiments with stabilized urea in year 2011/12. In each experimental year, we established nine different variants of autumn and spring nitrogen fertilization of winter oilseed rape line variety Californium. We applied these nitrogen fertilizers: ammonium nitrate with limestone, urea and stabilized urea (ALZON and UREA stabil). The autumn dose of nitrogen was 45 kg/ha, and the spring dose was 155 kg/ha. Nitrogen application had almost at all variants positive influence on dry matter production of aboveground biomass. All variants fertilized with nitrogen surpassed in yield unfertilized control variant. Highest yields in evaluated years were achieved in variants with 45 kg/ha of nitrogen in autumn fertilization. Overall, the highest yields were achieved in variants with stabilized ureas: variant 7 (45 kg UREAstabil autumn + 155 kg UREAstabil - spring) = 3.76 t/ha and variant 8 (45 kg ALZON - autumn + 155 kg ALZON - spring) = 3.77 t/ha. In experiments was confirmed the efficiency of the use of stabilized nitrogen fertilizers in rapeseed nutrition.