TY JOUR TI EFFICIENCY OF BIOSTIM BIOPREPARATION ON ROSS 140 SV CORN CROPS KW biopreparation KW Biostim Corn KW field germination KW profitability KW cost price KW stem density KW corn KW productivity KW feed unit JO Vestnik of Kazan State Agrarian University AU Safiollin, F.N. AU Yakhin, I.F. AU Khismatullin, M.M. AU Lukmanov, A.. AU Karimov, A.Z. PY 2024 IS 19 PB Kazan state agrarian University