TY JOUR TI ORGANIC SUBSTANCE MINERALIZED POO L IN AGRICULTURAL CHERNOZEMS OF THE MIDDLE SIBERIA SOUTH KW soil KW mineralized organic substance KW vegetative remains KW microbial biomass KW mobile humus KW neogenic humus KW resistance to agrogene influence JO Bulletin of KSAU AU Chuprova, V.V. PY 2013 IS PB Krasnoyarsk State Agrarian University