TY JOUR TI The effect of biological preparations on the indicators of biological activity of typical slightly eroded chernozem KW biopreparations KW nitrogen fertilizers KW by-products KW C–CO2 production KW cellulosolytic activity KW soybean KW fodder beans JO Agrarian Bulletin of the AU Chuyan, N.A. AU Breskina, G.M. PY 2022 IS 220 PB Ural State Agrarian University