PRODUCTIVITY AND WEEDINESS OF BLUE LUPINE AGROPHYTOCENOSIS DEPENDING ON THE AGROTECHNICAL MEASURES

The article focuses on the research results concerning the effects of preemergence mellowing and primary tillage methods on the weediness and productivity of blue lupine agrophytocenosis under conditions of Ukrainian Polissya. The application of preemergence subsurface tillage decreases by 27-37% the weediness of blue lupine sowings before harvesting and by 11-35% the air-dry mass of weeds as compared to usual tillage. The decrease of agrophytocenosis weediness provides blue lupine seed productivity increase by 11.5-17.9%. Ploughing to a depth of 18-20 cm decreases by 79% the amount and by 58% the mass of weeds in blue lupine sowings in comparison with disking to a depth of 10-12 cm. The research has proven that the ratio of blue lupine vegetative mass to weed biomass in case of ploughing is three times larger than in case of disking to a depth of 8-10 cm. The highest blue lupine seed productivity occurs in case of moldboard tillage. Disking to a depth of 10-12 cm decreases by 22% seed productivity as compared to ploughing