TY CONF TI Techniques for improving old-age hayfields of the forest-steppe of near the Ob river KW yield KW old-aged hayfield KW botanical composition KW herbage KW direct drilling KW productivity KW perennial leguminose grasse JO Multifunctional adaptive fodder production 29 (77) AU Tyuryukov, A.G. PY 2022 PB Federal Williams Research Center of Forage Production and Agroecology