TY CONF TI Efficiency of cultivation of perennial legume-grass mixtures on gray forest soils of Kaluga region KW grass mixture KW metabolic energy KW crude protein KW energy efficiency ratio KW sugar and protein balance KW humus KW soil acidity JO Multifunctional adaptive fodder production23 (71) AU Lukashov, V.N. AU Korotkova, T.N. AU Isakov, A.N. PY 2025 PB Federal Williams Research Center of Forage Production and Agroecology