In the article agroecological factors of competitive bioorganic varietal technology of soybean cultivation which provides development of regulations of application of a complex of alternative types of fertilizers for their cultivation in the context of short-term and long-term action and basic superstructure of factor estimation of block. As part of joint research work of Vinnytsia National Agrarian University and the Institute of Bioenergy Crops and Sugar Beets of the National Academy of Agrarian Sciences of Ukraine, the authors were involved in research theme "Development of methods for improving the technology of growing legumes using biofertilizers, bacterial preparations, foliar fertilizers and physiologically active substances". To establish the reliability of yield data by analysis of variance, it was determined that LSD 0.05 for factor A in 2017 was 0.09 t/ha. The largest deviations of yield indicators to control among varieties were: variety Podilska 416 +0.41 t/ha, variety Chernivtsi 9 – 0.27 t/ha and variety Agate -0.66 t/ha, which exceeded the value of LSD 0.05 for the factor A (soybean variety) by +0.32, – 0.18 and – 0.57 t/ha, respectively.

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The mass of grains from the plant is one of the main features that determines the final productivity of soybeans. In the control (without the use of biological products), the weight of grains from one soybean plant of the Suzirria variety was 10.2 g, of the Danaia variety — 9.8 g, and of the Estafeta variety — only 7.8 g. Seed inoculation with Rhizobophyte and complex use of biological products (Rhizobophyte + Phosphoenterin + Biopolycid) increased the individual productivity of soybean plants. In particular, in the variant with seed treatment with Rhizobophyte, Phosphoenterin and Biopolycid, the weight of grains from one soybean plant of the Estafeta variety increased to 8.2 g, of the Danaia variety to 10.3 g, and of the Suzirria variety to 11.2 g. The lowest number of beans per plant of Bukovynka beans was observed in areas without seed inoculation — 9.6 pcs. Nata beans were characterized by a larger number of beans (10.0 pieces) and grains (41.9 pieces) per plant. Seed inoculation increased the number of beans and seed weight on plants of the studied varieties. Thus, with the use of Rhizoactive on crops of Bukovynka beans, 10.1 beans and 42.3 grain pieces per plant were formed, Nata variety — 10.8 beans and 46.3 grain pieces on one plant. Among the studied varieties in the variant without the use of fertilizers, the higher grain yield was in the Nata bean variety — 2.38 t/ha. The productivity of beans was significantly affected by inoculation of seeds with Rhizobophyte: grain yield of Bukovynka variety increased by 0.09 t/ha or 4 %, Nata variety — by 0.17 t/ha or 7 %. Conclusions. Suzirria soybeans provided the best yield structure. In particular, in the variant with seed treatment with Rhizobophyte, Phosphoenterin and Biopolycid, the weight of grains from one soybean plant of the Suzirria variety was 11.2 g, Danaia variety — 10.3 g, and Estafeta variety — only 8.2 g. Bacterization of seed by biological products contributed to the increase in grain productivity of soybean plants by 3–17 %. Under the conditions of the research, the Nata bean variety was more productive, forming 10.2—10.4 g of grain per plant, which was 0.2—1.2 g more than the Bukovynka bean variety.

Purpose. To investigate the effect of complex water-soluble fertilizers Wuxal Extra CoMo, Wuxal Microplant and Avatar-1 on the structure and yield of soya varieties under the conditions of Western Forest-Steppe. Methods. Measuring of biometric parameters of plants and yield of soya bean. Results. The best results of the yield structures in all the varieties under study marked in the treatment including the introduction of N 30 P 60 K 60 , seed treatment with Rizohumin and foliar feeding with Wuxals. 'Omega Vinnytska' and 'Femida' varieties had their lower pods the highest attached. 'Omega Vinnytska' variety set the maximum number of pods and seeds per plant. The largest weight of 1000 seeds was measured in 'Ksenia' variety and the maximum weight of seeds per plant in 'Omega Vinnytska'. It was found that, under the conditions of Western Forest-Steppe, on deep low-humus heavy-loamy black soil, the maximum yield of soya bean was obtained in the treatment with Rizohumin, micro fertilizer Wuxal Extra CoMo, mineral fertilizers N 30 P 60 K 60 and foliar feeding with Wuxal Microplant. All the varieties under study exceeded standard variety 'Ksenia' in terms of productivity, with 'Omega Vinnytska' being the most productive one. Conclusions. 'Omega Vinnytska' showed the best results in terms of the structure and bean yield (3.62 t/ha) in the treatment with Rizohumin, micro fertilizer Wuxal Extra CoMo, mineral fertilizers N 30 P 60 K 60 and foliar feeding with Wuxal Microplant.