Using natural product to reduce stress effects of herbicides in the Amur region

The effect of herbicides (active ingredients cycloxydim and bentazone) and a natural product (based on seaweed extract) on the biochemical composition of soybean seeds and the productivity of the plants were investigated. Seeds and plants of mid-season soybean cv. Nevesta developed by Russian Research Institute of Soybean were studied. The experiments were conducted on the experimental field of Russian Research Institute of Soybean, Sadovoe village (Tambov District, Amur Region) in 20212023. The test plot was 11.25 m2, there were four replicates, the arrangement of samples was randomized. The treatment of soybean crops was carried out in the phase of first triple leaf with herbicides: Bison (a. i. bentazone) at a dose of 1.5 L/ha and Stratos Ultra (a. i. cycloxydim) at a dose of 1 L/ha; and BioAlgo bioproduct at a dose of 5 ml/ha. It was found that the combined use of BioAlgo and herbicides had a positive effect on formation of soybean plant productivity. The survival rate increased by 3 % in the variant where vegetative plants were treated with herbicides and bioproduct compared to the control, and by 6 % compared to herbicidal treatment. The number of beans per plant increased by 3.8 beans (LSD05 = 3.4), number of seeds per plant increased by 10.1 seeds (LSD05 = 7.2) and seed weight per plant increased by 1.66 g (LSD05 = 1.33) in the variant with the treatment of vegetative plants compared with the control. At the same time, soybean yield in the variants ranged from 2.15 (treatment of vegetative plants with herbicides) and 2.79 t/ha (treatment of vegetative plants with bioproduct and herbicides), in the control this indicator was 2.10 t/ha. The content of total protein and fat in Nevesta soybean seeds increased by 2.32 and 1.07 %, respectively, compared to the control.