THE EFFECT OF INOCULATION AND FOLIAR FERTILIZATION WITH COMPLEX MICRONUTRIENTS ON THE EFFECTIVENESS OF SYMBIOTIC ACTIVITY AND PRODUCTIVITY OF SOYBEAN VARIETIES

The article presents the results of research in 2023-2024 to study the effect of inoculation and foliar fertilization with complex micronutrients on the effectiveness of symbiotic activity and productivity of soybean varieties. The research material was soybean varieties of the FSC LGC breeding: Slava, Orleya, Mezenka and Zusha. According to the research data, it was established that agricultural practices activated the symbiotic activity of plants: compared to the control variant, pre-sowing treatment increased the number of nitrogen-fixing nodules on the root system of all studied varieties by 20.1-44.7% and the dry weight of nodules by 6.2-23.7%, contributed to the growth of nitrogenase activity by 0.11-1.32 mkg N2/ml/h/1 plant, the combined use of inoculation and foliar feeding increased the corresponding indicators in all varieties by 35.7-80.5%, 10.8-55.9% and by 1.77-2.76 mkg N2/ml/h/1 plant. Under the influence of inoculation with the microbiological preparation Hykout Super Soybean there was an increase in dry biomass of plants in the flowering phase on average by 6.5%, foliar feeding with complex microfertilizer and plant growth and development stimulant ‘Sunny Mix’ Legumes vegetation led to an increase in dry matter mass by 10.8%. High efficiency of complex treatment with microbiological preparation and microfertilizer was confirmed by analysis of yield structure elements: in relation to the control, seed weight per plant in all varieties increased by 5.5-15.4%, weight of 1000 seeds increased by 2.28-3.48 g. It should be noted that in Zusha variety the joint application of treatments had an active effect not on all the studied indicators: the number of nodules, seed weight per plant and 1000 seed weight were less or at the level of the variant with inoculation. The greatest effect of foliar feeding on yield was found only on Slava variety (0.26 tonnes/ha increase). The dependence of yield on inoculation in soybean varieties was not significant except for Zusha variety in 2023 and Slava variety in 2024, which is obviously due to the settlement of the experimental field by spontaneous rhizobial microflora.