TY JOUR TI INFLUENCE OF MICROELEMENTS AND MINERAL FERTILIZERS ON PRODUCTIVITY AND QUALITY OF SPRING WHEAT GRAINS KW microelements KW germination safety KW productivity KW mineral fertilizers KW spring wheat KW grain payment. JO Vestnik of Kazan State Agrarian University AU Amirov, M.F. PY 2018 IS 12 PB Kazan state agrarian University