TY JOUR TI IMPROVEMENT THE SUSTAINABILITY OF GRAIN PRODUCTION (ON THE PROCEEDINGS OF THE REPUBLIC OF TATARSTAN) KW sustainability KW grain farming KW productivity KW increase of efficiency KW optimal level of payback. JO Vestnik of Kazan State Agrarian University AU Avhadiev, F.N. AU Mukhametgaliev, F.N. AU Sitdikova, L.. PY 2017 IS 11 PB Kazan state agrarian University