The effect of fertilizers and tillage on productivity and seed quality of winter rapeseed in the south of Ukraine

In the conditions of the south of Ukraine on the irrigated lands was studied the influence of different doses of mineral fertilizers on productivity and seed quality of winter rapeseed. The practicability of application of post-harvest residues of winter wheat as an organic fertilizer was also determined. The productivity of rapeseed under the moldboard plowing in all variants of experiment was higher than under the subsurface tillage, by 0.18 t/ha on the average. The straw embedding contributed to formation of productivity increase within the limits of 0.15-0.19 t/ha. It was determined that the method of primary tillage did not influence the content of raw protein and oil in seeds. It was revealed that along with the straw usage, the application of mineral fertilizers in a dose of N 90P 90K 30 for plowing and N 30 in spring for nutrition provided the production of the highest seed yield of rapeseed, relative oil yield per one hectar, and the calculated dose (N 177P 25K 0) provided the highest protein yield.