%0 Conference Article %T Techniques for improving old-age hayfields of the forest-steppe of near the Ob river %A Tyuryukov, A.G. %K yield, old-aged hayfield, botanical composition, herbage, direct drilling, productivity, perennial leguminose grasse %J Multifunctional adaptive fodder production 29 (77) %D 2022 %P 5 %I Federal Williams Research Center of Forage Production and Agroecology