IN SOYBEAN CROPS IN THE SOUTH OF THE FAR EAST

The purpose of the study is to determine the sensitivity of a number of crops to the residual amount of successive applications of Flex 1.5 l/ha and Fusilad Forte 1.5 l/ha herbicides in soybean crops. The stud-ies were carried out in 2020–2021 in the Far Eastern Research Institute of Plant Protection in the condi-tions of a growing house using the method of biological indication of soil stocks of herbicides (determina-tion of volumetric phytotoxicity of the area). The seeds of the tested crops were sown in meadow-brown podzolized soil, especially after harvesting soybeans treated with herbicides in the phase of two trifoliate leaves. During the growing season, test cultures recorded all signs of damage and inhibition of plants by residual amounts of herbicides. After cutting the experimental plants to reduce their wet aboveground weight and height compared to the control (without the use of herbicides), final conclusions were made about the degree of toxicity for the tested crops of herbicide residues and their active metabolites pre-served in the soil. According to the reduction in plant mass, as the most objective criterion for assessing the phytotoxicity of herbicides, the crops were arranged in order from the most sensitive to the most re-sistant as follows: tomatoes < carrots < rapeseed < buckwheat < table beet < white cabbage < cucumber < rice. Tomatoes showed the maximum negative reaction to soil residues of herbicides, both in terms of a decrease in the aboveground mass and plant height. Weight and height of barley, oats, wheat, corn and sunflower were at the level of control values. The next year after the use of preparations based on fomesafen, it is recommended to exclude crops sensitive to soil residues of Flex herbicide from the crop rotation with soybeans.