TY JOUR TI COMPOSITION AND WEED HARMFUL IMPACT ON WHEAT CROPS IN THE SAMARA FOREST-STEPPE REGION KW landscape KW be weedy KW biomass KW productivity KW yield JO Bulletin Samara State Agricultural Academy AU Sharapov, I.I. AU Kaplin, V.G. PY 2021 IS 6 PB Samara State Agricultural Academy