TY JOUR TI AGROECOLOGICAL ZONING OF THE TERRITORY OF KIROV REGION FOR OAT CROPS PLACEMENT KW productivity KW sown areas KW agro-ecologically similar territories KW crop variability JO Vestnik of Kazan State Agrarian University AU Mukhamadiarov, F.F. AU Permyakova, E.A. PY 2023 IS 18 PB Kazan state agrarian University