CHANGES IN THE PESTICIDES DECOMPOSITION RATE UNDER THEIR COMBINED APPLICATION IN AGRICULTURAL PRODUCTION

The purpose of research is to study the dynamics of the decomposition of individual active ingredients of pesticides in plant tissues when used in tank mixtures. The field part of the study was carried out on the territory of the Educational, Scientific and Production Center for Horticulture and Vegetable Growing named after V.I. Edelshtein FSBEI HE Russian State Agrarian University – Moscow Timiryazev Agricultural Academy, the laboratory part was carried out at the Educational and Scientific Consulting Center “Agroecology of Pesticides and Agrochemicals” in Moscow during 2020–2021. Research was carried out on crops of spring wheat, oats, spring barley, peas, spring rape, potato plantings, as well as apple tree plantings. Chemical treatments were carried out with insecticides and fungicides approved for use on these crops – Skor, KE; Borey Neo, SK; Tilt, KE; Imidor, VRK; Kumir, SK; Sirocco, KE. The experiment included options with the use of drugs in tank mixtures and options with their separate use. Samples of plant products were taken for further analysis for pesticide content. In laboratory conditions, the level of residual amounts of active drugs in plant samples was analyzed using gas-liquid chromatography and high-performance liquid chromatography methods. The change in the level of pesticide residues in different experimental variants was assessed. The acceleration of the decomposition of the active substance, imidacloprid, on crops of peas, spring wheat, oats, spring barley and spring rape when used together with the drug Tilt, KE was established. Also, the use of the fungicide Skor, KE together with the insecticide Borey Neo, SK (150 g/l imidacloprid + 50 g/l lambda-cyhalothrin) on the apple tree caused a slowdown in the rate of decomposition of the active substances lambda-cyhalothrin and imidacloprid. The use of the copper-containing fungicide Kumir together with the insecticide Borey Neo, SK on the apple tree caused an acceleration of the disintegration of the active substance imidacloprid. The combined use of the fungicide Skor, KE with the insecticides Sirocco, KE and Borey Neo, SK accelerated the decomposition of the active substance difenoconazole.