The influence of different methods and norms of application of the herbicide Pivot on weed vegetation and productivity of soybean varieties Kasatka

Abstract

Relevance. The growth of acreage under soybeans caused an increased demand of agricultural producers for drugs for the control of harmful objects. Herbicides are one of the most popular classes of pesticides used in many types of crop production.Methods. The effect of the water-soluble herbicide Pivot with consumption rates of 0.5 l/ha and 0.8 l/ha was studied in the experiment. A model variety of soy Killer whale was taken for research. Experience options: spraying the soil before sowing with sealing; spraying the soil before soybean seedlings; spraying plants in the phase of two triple leaves; control (without treatment). The studies were carried out by field and laboratory methods using appropriate techniques.Results. It was found that with a high mixed type of contamination of soybean crops (74–88 pieces of weeds / m2 in control), the use of different methods and norms of the herbicide Pivot, VC proved to be highly effective and safe for culture: reduction of the number of weeds, % to control at a rate of 0.5 l/ha — 86.4–88.1%, at a rate of 0.8 l/ha — 89.2–92.9%. The reaction of soybeans to a decrease in clogging, in comparison with the control, was manifested in an increase in: the number of branches — by 30.0–41.7%, the number of beans — by 40.7–53.0%, the number of seeds from one plant — by 32.2–55.0%, the mass of seeds from one plant — by 52.2–60.4%, the mass of 1000 seeds — by 27.3–30.7%. The average yield of soybeans in the control was 1.36–1.38 t/ha. In the variants with the use of herbicides, reliable crop yield increases of 30.7–52.9% were obtained. When conducting a comparative analysis of the rates of herbicide application on structural indicators and soybean yield, the advantage of a dosage of 0.8 l/ha was revealed, and when comparing the methods of application — spraying the soil before soybean seedlings.