LEVEL OF INJURIOUSNESS OF WEEDS AND PRODUCTIVITY TSENOSES OF SUNFLOWER IN THE CONDITIONS OF THE NORTHERN STEPPE OF UKRAINE
The most harmful weeds in sunflower agrophitotsenoses at its cultivation in the conditions of the northern Steppe of Ukraine are established. Level of quantity of a weed of Lactuca tatarica of 30 pieces/sq.m brings to loss of productivity of sunflower on 1,04 t/hectare against application in a crop rotation of the combined tillage of the soil, on 1,12 t/hectare against application of antierosion tillage of the soil. The system of the combined tillage of the soil provides decrease in a quantity of weeds of crops by 3,1 times and increase of productivity of sunflower for 32,7%.