TY JOUR TI INFLUENCE OF THE MINERAL NUTRITION LEVEL ON THE PRODUCTIVITY OF CEREAL AND LEGUMINOUS AGROCENOSES IN THE FOREST STEPPE OF BAIKAL KW productivity KW botanical composition KW green mass KW feed value KW fertilizers KW agrocenosis KW cereals KW legumes JO Vestnik of Kazan State Agrarian University AU Agafonov, V.A. AU Boyarkin, E.V. PY 2019 IS 14 PB Kazan state agrarian University