Formation of structure elements of soybean harvest

Topicality. Quantitative indicators of each structure element of productivity directly affect the formation of high yields. The soil and climatic conditions of the region and certain elements of the cultivation technology, in particular, the application of fertilizers, are the determining factors of soybean productivity formation. Purpose. To establish the influence of inoculation and nutritional conditions on the formation of structure elements of the soybean yield for ultra-early variety Merkur. Methods. Special and general scientific methods were used in the research. For 2019–2020, field trials were conducted on typical low-humus chernozems in the conditions of the Kyiv region. The experiment was two-factor: factor A - nutritional conditions created by different rates of fertilizers and growth regulator Gulliver Stymul against the background of mineral fertilization in ВВСН 13-15; ВВСН 51-55; factor B – seed inoculation with Nitrofix P (dry inoculant for soybeans). Results. According to the results of research, the influence effectiveness of nutritional conditions, growth regulators, seed inoculation on the formation of soybean yield structure elements for the Merkur variety are presented, and the interrelationship between these factors is identified. It was established that the formation of soybean productivity elements depends on the studied factors and environmental factors. Conclusions. Increased fertilizer rates significantly increased the number of pods per plant and the number of seeds per pod. Dynamics of increasing the 1,000 seed weight was also observed both in variants with seed inoculation with Nitrofix P, and without seed inoculation. Correlation analysis between the soybean yield structure elements and fertilizer variants revealed a strong positive correlation between them. Correlation-regression analysis, both without seed inoculation and with seed inoculation, revealed a linear dependence, which characterized by a strong correlation between soybean yield and fertilizer variants, with an approximation confidence value of R2 = 0.951. Key words: Gulliver Stymul, yield structure elements, correlation dependence, 1,000 seed weight, Nitrofix P, soybeans, fertilizers, nutritional conditions, yield