TY CONF TI Economic efficiency of creation and long-term use of different-ripening grass stands for hay harvesting KW early and medium-ripening grass stands KW two mowing KW longevity KW capital investment KW annual production costs KW feed cost KW conditionally net income JO Multifunctional adaptive fodder production AU Zhezmer, N.V. PY 2024 PB Federal Williams Research Center of Forage Production and Agroecology