TY JOUR TI RESOURCE-SAVING MODELS OF SPRING WHEAT CULTIVATION TECHNOLOGIES IN THE CONDITIONS OF THE FOREST-STEPPE OF THE MIDDLE VOLGA REGION KW traditional KW resource-saving KW minimal agricultural technology KW productivity KW efficiency JO Vestnik of Kazan State Agrarian University AU Sabitov, M.M. AU Zaharov, S.A. PY 2021 IS 16 PB Kazan state agrarian University