Effect of inoculation with microbiological preparations on morphological characteristics and yield of vegetable soybean

Relevance. Vegetable soybean is a special variety with high added value, consumed fresh and harvested at the stage technical ripeness (R6). Accession-A is one of the promising vegetable soybean materials, studied and identified as a result of work that was carried out jointly with the Federal Scientific Vegetable Center in the Moscow Region (FSVC) and the Agrobiotechnology Department of the Agricultural Technological Institute (ATI) of the RUDN University named after Patrice Lumumba. The use of microorganisms to promote atmospheric nitrogen fixation is a common practice in soybean production.Methodology. The purpose of this study was to evaluate the effect of two microbiological preparations based on Sinorhizobium fredii and Bradyrhizobium jaроniсum in order to identify which microbiological preparation gives the best results in terms of morphological indicators and vegetable soybean yield under the conditions region of the Non-Chernozem zone of the Russian Federation. The object of the study was accession-A of vegetable soybean. Two types of treatment were carried out: B1 – treatment with a preparation with Bradyrhizobium jaronicum (1 l/t of seeds), B2 – treatment with a preparation with Sinorhizobium fredii (1 l/t of seeds). Control without treatment (K).Results. According to statistical analysis of biometric indicators, it was found that treatment with S. fredii (B2) had the highest average values for indicators of stem diameter (11.50 mm), lower pod attachment height (11.19 cm), number of branches (3.40 pcs.) and the number of productive nodes (27.48 pcs.). Preparation B2 improved the structure of the crop, influencing the obtainment of the highest indicators of plant weight (30.47 g), seed weight per plant (15.33 g), weight of 1000 seeds (171.25 g), number of seeds per plant (98.50 pcs.), number of seeds in a bean (2.89 pcs.) and seed yield (3.11 t/ha). The use of microbiological preparations based on B. japonicum and S. fredii gave better results compared to the control treatment.