The effectiveness of cultivating soybean varieties of different maturity groups in the conditions of the central Ciscaucasia

The studies were conducted in 2017-2019 at the experimental station of Stavropol State Agrarian University conditions without irrigation and on basis plots Agrosakhar LLC with use irrigation. territories research sites belong to zone unstable humidification, characterized by uneven precipitation during growing season soybeans, elevated air temperatures summer, when soybean plants enter phases flowering grain filling. At SSAU station, soil is represented leached chernozem, Agrosahar ordinary chernozem. purpose determine biological characteristics efficiency new, promising varieties southern ecotype. It was found that most quickly-ripening variety a 96 days Bara variety, longest noted mid-ripening Vilana – 129 days. maximum photosynthetic potential crops formed under conditions: Selecta 101 1376, early-ripening Duar 1678 Zara 2167 thous. m2.day/ha. In terms yield, soybeans group, Lira stood out 1.59 t/ha, 201 1.75 t/ha midripening 1.94 used 2.34 2.89 3.14 t/ha. largest profit amount 16028 40912 rub./ha obtained cultivating yield - level profitability ranged from 49.4 108.8%.