TY JOUR TI AGROPHYTOCENOSIS CONTAMINATION AND OF SPRING WHEAT PRODUCTIVITY IN THE OMSK REGION FOREST-STEPPE KW crop rotation KW spring wheat KW tillage system KW chemicals KW agrophytocenosis KW contamination KW species composition KW conjugacy KW grain yield JO Bulletin of KSAU AU Yushkevich, L.V. AU Schitov, A.. AU Yuschenko, D.N. PY 2022 IS 0 PB Krasnoyarsk State Agrarian University