TY JOUR TI EFFECT OF LIQUID ORGANIC AND MINERAL FERTILIZERS ON PRODUCTIVITY AND QUALITY OF CORN GREEN MASS KW nitrogen KW zinc KW organic and mineral fertilizers KW green mass KW corn (Zea mays) JO Vestnik of Kazan State Agrarian University AU Safin, R.. AU Ziganshin, A.A. PY 2025 IS 20 PB Kazan state agrarian University