INFLUENCE OF BIOLOGICAL PREPARATIONS ON THE DYNAMICS OF THE ACTIVE SYMBIOTIC POTENTIAL OF SOYBEAN

According to the research results, the peculiarities of the influence of the technology of growing different varieties of soybean on the dynamics of the formation of the number of active nodules on the roots of soybean plants were determined and analyzed. It was established that for both studied varieties of soybean Artemida and Monroe, the use of bioinoculant in combination with the mycorrhizal- forming biological preparation Mycofriend and the biofertilizer Groundfix Extreme significantly increases the number of active nodules on the roots compared to the control (Bioinoculant-BTU). The indicators of the number of active nodules reach a maximum when using the combined treatment of seeds and soil Mycofriend ( 1.5 l / t of seeds ) + Groundfix Extreme ( 4 l / ha). In particular, in the Artemida variety at the beginning of the growing season − 13.7 pcs / plant, and in Monroe − 12.6 pcs. / plant. All options demonstrate the dynamics of the increase in the number of nodules from the phase of the 3rd trifoliate leaf to the end of flowering. The highest value is observed in the end of flowering phase – 34.2 pcs./ plant in the Artemida variety with combined use of the studied biological products. All variants demonstrate the dynamics of the increase in the numbe r of nodules from the 3rd trifoliate leaf phase to the end of flowering. In addition, in accordance with the research program, we established the features of the formation of the mass of active nodules on the roots of soybean plants depending on the pre-sowing treatment of seeds and soil. The maximum mass of active nodules was observed in the end of flowering phase in the variant of the experiment with t he comple x use of biological products Bioinokulant-BTU (3 kg/t of seeds) + Mikofrend (1.5 l/t of seeds) + Groundfix Extreme ( 4 l/ha). The results of the studies also indicate an increase in the indicators of the active symbiotic potential with the combined use of the studied biological product s. In the initia l phases of development (3rd trifoliate leaf) in the control variant where inoculation was carried out with the drug Bioinoculant−BTU (3 kg/t of seeds),the value of the active symbiotic potential was recorded in the Artemida variety of 0.282 thousand kg day/ha and in the Monroe variety of 0.369 thousand kg day/ ha. In the va riants with the addition of the mycorrhizal- forming biological product Mycofriend, an increase in the indicators to 0.297 and 0.542 was noted in the Artemida and Monroe varieties, respectively. The maximum indicators in different phenological phases of growth and development of soybean plants were observed when using the combined treatment of seeds and soil with the biological products Mycofriend ( 1.5 l/t of seeds) + Groundfix Extreme (4 l/ha).