TY JOUR TI SPECIFIC FEATURES OF AGRICULTURAL RECULTIVATION DURING CHEMICAL DEGRADATION OF CHERNOZEM IN THE STEPPE ZONE OF ZAVOLGA PROVINCE KW chernozems KW degradation KW mineralization KW formation waters KW agrochemical indicators KW reclamation KW economic assessment JO Bulletin Samara State Agricultural Academy AU Trots, N.M. AU Gorshkova, O.V. PY 2021 IS 6 PB Samara State Agrarian University