Abstract

In the field experiments of the Department of Plant Production, Selection and Vegetable Growing of the Belgorod SAU in 2015- 2016, we found out the following facts at a comparative study of the effect of Nitragin KM and ammonium nitrate on the growth and development of Belgorodskaya 8 soybean:Processing of soybean seeds with Nitragin KM, created in NTTS BIO LLC (Shebekino, Belgorod region), significantly (from 25 in control to 34 pcs/plant) increased the number of active nitrogen-fixing nodules on plant roots. This increased the intensity of increasing the mass of plants and the area of leaves, increased the yield from 27.5 c/ha in control to 30.7 c/ha (by 11.6 percent), improved the quality of grain (protein content increased by 2.9 abs.%, oil content - by 3.1 abs.%), increased the protein harvesting from 935 kg/ha in control to 1,112 kg/ha and the collection of oil in the seed yield ̶from 479 kg/ha to 618 kg/ha. The duration of soybean vegetation decreased from 111 (in control) to 102 days, the cost of production decreased by 8.1%, the profit increased by 17.2%, the profitability increased by 20%. Surface top dressing of soya with ammonium nitrate (2 c/ha) shortly before budding also improved growth, leafiness and increased plant productivity (but to a lesser extent than seed Nitraginization) ̶yield increased from 27.5 to 29.2 kg/ha, protein content ̶from 39.6 to 42%, oil content ̶from 20.3 to 22.2%. At the same time, protein harvesting increased from 935 to 1,055 kg/ha, oil ̶from 479 to 557 kg/ha. At the same time, the vegetation period of soybean plants increased from 111 days to 116 days.The use of domestic Nitragin KM for inoculation of soybean seeds, the retail price of which is 2-3 times less than foreign analogues, is very promising. Nitrogen soybean fertilizer, if necessary, can be an alternative or additional method of increasing the yield and quality of soybean grain products.The goal of our study is to reveal the comparative effect of soybean seed treatment with Nitragin KM and late nitrogen fertilizer on plant development, yield, protein content and soybean oil content in the forest-steppe of the CBE economic region. Key words: soybean, Nitragin KM, inoculation, ammonium nitrate, fertilizer, yield, protein content, oil content, cost, profit, profitability.

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