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A reliable element of the technology for growing environmentally friendly products of early-ripening soybean varieties, and improving soil fertility, is the introduction of environmentally friendly growing technology based on the optimal functioning of the symbiotic system, without using mineral fertilisers, in particular nitrogen and pesticides. The purpose of the research was to explore the effect of inoculation of seeds of diverse soybean varieties with nitrogen-fixing and phosphorus-mobilising preparations, foliar fertilisation and their combination on growth, plant development and productivity under organic cultivation technology. The research was conducted using generally accepted methods, the field method, and the method of statistical evaluation of results. Experimental studies have established that with the introduction of high-yielding soybean varieties, using post-harvest residues (straw, stubble and root residues), green manure and legumes in a short rotation crop rotation, 136 kg of nitrogen and 142 kg of biologically fixed nitrogen enters the soil. It was demonstrated that seed treatment with AgriBacter inoculant and soybean fertilisation with Nanovit Super complex fertiliser ensures a yield of 4.08 t/ha for Mentor and leaves almost 30% of biological nitrogen in the soil. Studies have demonstrated that an integrated approach to the treatment of soybean seeds of the tested varieties with AgriBacter and Phosphoenterin inoculants, a strain of bacteria that decomposes hardly soluble organic phosphates, which in turn contributes to better nutrition of soybean plants, development of the root system, and has a positive effect on the development of an optimal stem density of 410-490 thousand units/ha, which provides an increase in the yield of soybean varieties by 1.88 t/ha. It was established that simultaneous inoculation of seeds and foliar feeding of soybeans with the biologically active complex Nanoactiv with the addition of magnesium sulfate in the macrostage BBCH 60-63 provides the highest yield of Niagara variety – 4.08 t/ha and Astor variety – 2.88 t/ha. Thus, in a shortrotation 4-season crop rotation saturated with legumes, using nitrogenfixing, phosphorus-mobilising preparations and the active growth stimulator Nanovit Super + Magnesium sulfate, soil fertility increases and the nitrogen content in the soil doubles. The scientific results can become the foundation for improving soil fertility, which will ensure sustainable yields in organic soybean cultivation |
