The Mechanism of Action of Rhizobacteria Enterobacter nimipressuralis 32-3 on the Mineral Nutrition and Productivity of Soybean

The aim of the research was to study the mechanism of action of soil rhizobacteria E.  nimipressuralis 32-3 on the elements of mineral nutrition of soybean (сontent of N and Р₂О₅  in shoot, productivity of plants), qualitative and quantitative content of phytohormones in cultural liquid of this strain. Pot experiments were carried out in greenhouse during two seasons (2014 and 2015) to evaluate the influence of the strain Enterobacter nimipressuralis 32-3 on the  growth, productivity of soybean (cultivar Krepysh) and accumulation Р₂О₅, total N in shoot. The results revealed that pre sowing seed inoculated by E. nimipressuralis 32-3 increased the content of N and P₂O₅ in shoot of soybean by 28-46% and 12-14% respectively compared to the control (against control accordingly). It was established that improvement of mineral nutrition of plants with inoculation contributed to increasing their productivity and height. So, biomass of dry shoot soybean increased by 30% and 14% against control, amount of beans on the plants with inoculation exceeded control dates by 64-70%. It was showed that the height of plants with inoculation increased by 15-17% compared to the control. The determination of quantitative (methods of thin-layer chromatography) compound of phytohormones, which are produced by E. nimipressuralis 32-3 was carried out in the experiments. It has been established that in the cultural liquid of this strаin there are physiologically active substances of phytohormones: auxin, gibberellins and cytokinin line.