TY JOUR TI EFFECT OF SOIL CULTIVATION METHODS ON PRODUCTIVITY AND QUALITY OF POTATOES OF DIFFERENT VARIETIES IN THE CONDITIONS OF FOREST-STEPPE IN MIDDLE VOLGA REGION KW variety KW soil cultivation KW leaf surface KW safety KW mass of tubers KW productivity KW quality indicators KW starch KW vitamin C KW nitrates. JO Vestnik of Kazan State Agrarian University AU Vladimirov, K.V. AU Vladimirov, V.P. AU Mostyakova, A.A. PY 2018 IS 13 PB Kazan state agrarian University