TY JOUR TI SOWING AND PRODUCTIVE QUALITY OF SEEDS, DEPENDING ON THE NUTRITION BACKGROUND IN THE KAMA AREA OF THE REPUBLIC OF TATARSTAN KW spring wheat KW nutrition background KW yield KW seed quality. JO Vestnik of Kazan State Agrarian University AU Garaev, R.I. AU Shaykhraziev, S.S. AU Zubarev , S.. AU Ganiev , A.. AU Shaykhutdinov, F.. AU Serzhanov, I.. PY 2015 IS 10 PB Kazan state agrarian University