TY JOUR TI CROP PROPERTIES AND QUALITY OF SPRING WHEAT SEEDS DEPENDING ON THE FOOD BACKGROUND IN THE REPUBLIC OF TATARSTAN KW productivity KW spring wheat KW nutrition level KW precipitation KW correlation KW seed quality JO Vestnik of Kazan State Agrarian University AU Serzhanov, I.. AU Shaykhutdinov, F.. AU Serzhanova, A.R. AU Garaev, R.I. PY 2019 IS 14 PB Kazan state agrarian University