Studies had shown that the application of biological products Rhizostim and Optimize 400 significantly increased germination of seeds with application of phosphoruspotassium fertilizer and without fertilizers by 2.4–3.6%. The application of nitrogenfertilizer caused a significant reduction in field germination of seeds compared to the absolute control by 2.6%, while phosphorus-potassium fertilizer, on the contrary, increased this indicator by 3.5%. Nitrogen fertilizer had a significant positive effect on plant mass formation, where it increased compared to the absolute control by 9.4 g, which was 25.6%. The larger mass of plants was formed in the variants with the complex application of nitrogen fertilizer and biological products (47.0–47.5 g). The application of nitrogen fertilizer caused the reduction of the number of nodules compared to the absolute control by 14.0 pieces, which was 32.1%. With application of phosphorus-potassium fertilizer, on the contrary, there was an increase in the number of nodules by 15.3 pieces, or 35.1%. The highest productivity was in the application of biological products with phosphoruspotassium fertilizer (2.79–2.83 t/ha), with the productivity increase compared to the absolute control by 10.3–11.9%.
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