Rroductiviy of soybeans under the influence of microbial preparations

Purpose. The effectiveness of the use of microbial preparations Rhizogumin and Optimize on the formation of the bean-rhizobial complex by soybean plants and the yield of the crop was studied on order to investigate the effect of bacterial preparations Rhizogumin and Optimize on the productivity of soybean plants due to the improvement of nodulation. Methods. Field, quantitative, mathematical and statistical. Results. The influence of the microbial preparations Rhizogumin and Optimize on the formation of nodules and productivity of soybean plants was analyzed. During the research, it was established that due to spontaneous inoculation with indigenous strains of microorganisms, nodulation occurred on the roots of control plants. As a result of the pre-sowing inoculation of seeds with bacterial preparations, more active nodule formation was noted on soybean roots. Under the influence of rhizohumin, the maximum number of nodules was formed on the roots of soybean varieties Monada, Omega Vinnytska, and Knyazna varieties. However, the treatment of seeds with Optimize contributed to the formation of a greater number of nodules in variants with all investigated varieties. The maximum values for the effects of the preparation were noted in the Monada, Knyazna, Oksana, and Khutoryanochka varieties. When compared with the option without artificial seed inoculation, the highest increase in the number of nodules was found in Femida and Oksana varieties. Increase in the number of nodules was accompanied with the changes in the total mass of nodules. When using Rhizohumin, the mass of nodules increased, to the greatest extent in plants of the Monada and Knyazna varieties. The influence of Optimize also determined the increase in the mass of nodules, the maximum indicators were noted in the variant with the varieties Monada, Smolyanka, Oksana. It was established that the use of microbial regulators contributed to the optimization of soybean seed productivity in all of the studied options. Soybean yield increased when seeds were treated with Rhizohumin and Optimize. Under the action of Rhyzohumin, the maximum productivity was in the Monada and Knyazna varieties; under the influence of Optimize – in the Oksana and Smolyanka variety crops.