CONTROL OF WEEDS IN AGROPHYTOCENOSIS OF WINTER WHEAT DEPENDING ON SOIL TREATMENT AND FERTILIZATION SYSTEM

To establish the dependence of the influence of tillage and fertilization system in the conditions of short-rotation grain-fallow-cultivated crop rotation on the degree of weediness of winter wheat is the aim of the paper. Field and laboratory methods were used. The research was carried out in a long-term out-station experiment of Veselopodilsk research and selection station, on typical low-alkalinized chornozem black soil. The use of combined tillage contributed to the growth of weediness of crops, where in the unfertilized version there were 50.3 pcs/m(2), while using the plowing 46.8 pcs/m(2) were observed. When using the organic-mineral fertilization system 21.9 pcs/m(2) in combined tillage, and 16.4 pcs/m(2) in plowing were counted. When plowing post-harvest residues, an increase in the number of weeds was observed due to the use of plowing - 23.7 pcs./m(2), and the use of combined tillage - 20.8 pcs/m(2). Plowing contributed to the appearance of fewer weeds than in combined tillage, both in the unfertilized plot and with the use of organic-mineral fertilization system by 3.7 and 5.5 pcs/m(2), respectively. Plowing of post-harvest residues on the background of mineral fertilizing during plowing increased by 2.9 pcs/m(2) compared to combined tillage. The use of fertilizers significantly reduced weediness of crops, regardless of the type of tillage.