Plant and Soil Science

The article presents the results of studies on the effect of post-emergence herbicides and their tank compositions on soybean weeds. It was found that the use of Miura allowed to reduce the level of total weediness of crops, at the time of harvest by – 75 78 %, the raw weight of weeds – by 19– 46 %. It is established that the use of the tank mixture Harmony – 3 g/ha + surfactant Trend 0,2 l/ha + Bazagran – 1.5 l/ha, after 8-10 days Harmony – 5 g/ha and the use of anti-cereal drug Miura – 0,4 l/ga. With the introduction of such a tank mix, the death of dicotyledonous species a month after application reached 93 %, and the death of cereal weeds was – 84 %. The weight of those weeds that remained in the agrocenosis was 52 g/m², which is 87 % less than the control. The use of Harmony – 8 g/ha + Bazagran – 1.75 l/ha and the anti- cereal product – Miura – 0,6 l/ha helped to reduce the total weediness of crops by 86 % a month after the application of herbicides. The death rate of dicotyledonous weeds was 83 %. The total weight of weeds before harvest decreased by 91 % compared to the control and was 62 g/m². The maximum soybean harvest – 2,45 t/ha provided the use of a mixture of Harmony – 3 g/ha + surfactant Trend – 0.2 l/ha and Miura – 0.4 l/ha. Comparing yield were absent, this indicates that soybean yields inherbicide variants were lower. The studies herbicides and their compositions showed high selectivity to soybean plants. By reducing the level of weeding, they contributed to an increase in yield by 0,57–1,11 t/ha. Under conditions of mixed weeding, the following mixtures of post-emergence herbicides were the best: Harmony – 3 g/ha + Bazagran – 1,5 l/ha in 8-10 days Harmony – 5 g/ha and Miura – 0,4 l/ha; Harmony – 8 g/ha + Bazagran – 1,5 l/ha and Miura – 0,6 l/ha.

soybens, weeds, herbicides, yield, weed harmfulness