TY JOUR TI Productivity of potato of sprint variety, depending on the nutrition background on gray forest steppe soil of Middle Volga KW potato KW calculated doses of fertilizer KW variety KW productivity KW leaf surface KW quality indicators. JO Vestnik of Kazan State Agrarian University AU Gareev , I.. AU Vladimirov, V.P. AU Vladimirov, K.V. PY 2014 IS 9 PB Kazan state agrarian University