A productivity of winter rapeseed depending on methods of soil treatment and doses of nitrogen fertilizers applied at early-spring fertilizing in the south of Ukraine

The results of experimental studies for three years (2010-2011 and 2013) on the effect of the methods and the depths of systems of a primary soil treatment, different doses of nitrogen fertilizers on weediness and productivity of winter rape are presented. It is noted that the least amount of weeds was observed in the control variant when plowing on 25-27 cm without fertilization. The variant with chisel loosening to 14-16 cm in the differentiated-1 soil treatment with a slotting per rotation was the most similar to the control of their impact on the weedy crops. Researches revealed that the moldboard (on 25-27 cm) and dif-ferentiated-1 (14-16 cm) soil treatments, promoted higher productivity of seeds when applying nitrogen fertilizer in dose N100 from 2.59 to 2.65 t/ha.