TY JOUR TI GRAIN CROPS YIELD MODELS DEPENDING ON THE ORGANIC SUBSTANCE CONTENT IN THE SOIL KW yield model KW soil KW humus KW organic matter KW fertility. JO Bulletin of KSAU AU Trubnikov, Y.N. AU Shpedt, A.A. PY 2021 IS 0 PB Krasnoyarsk State Agrarian University