Field similarity is an important indicator that characterizes the ability of the seed to sprout and form the seedlings depending on the conditions of cultivation. According to research results, it was found that among the studied varieties, the highest indicators of field similarity were characterized by Vorskla - 86.1 % and Angelica - 85.6 %. Increasing the level of supply of nutrients during the growing season contributed to an increase in the number of plants before harvesting. The most survived plants (95.2 %) for making N60Р60К60. In the version for making the maximum dose of fertilizers (N90Р60К60), this parameter is reduced to 94.6 %. In our opinion, elevated doses of nitrogen fertilizers suppress the activity of tuber bacteria, which leads to a decrease in the intensity of growth and development of soybeans. In turn, the control of plant preservation was at the level of 93.8 %. It should be noted that the highest rates were characterized by crops of the Vorskla variety (95.2 %). A smaller percentage of plants survived before harvesting seedlings of Angelica (94.6 %) and Agat (93.9 %). It should be noted the positive effect of fertilizer on the total mass of tubers on soy plants. Thus, on the average, an increase in their mass per plant was found for fertilizing: P60K60 at 0.030 g; N30Р60К60 at 0.042 g; N60Р60К60 at 0.047 g compared to control. At the same time, like the number of tubers in the variant for making N90Р60К60 causes a decrease in these indicators. The established fact confirms the results of researches of other scientists that nitrogen fertilizers in the amount of 90-120 kg / ha suppress synthetic processes in tissues of certain legumes, act as inhibitors of the formation of symbiosis with nitrogen-fixing microorganisms of the soil