TY CONF TI EFFICIENCY OF ANTHROPOGENIC ENERGY COSTS IN THE CREATION AND LONG-TERM USE OF DIFFERENT-RIPENING CEREAL HAYFIELDS KW cereal hayfields KW different-ripening grass stands KW longevity KW metabolic energy KW natural factor KW agro-energy efficiency JO Multifunctional adaptive fodder production 26 (74) AU Zhezmer, N.V. PY 2021 PB Federal Williams Research Center of Forage Production and Agroecology