TY JOUR TI PRODUCTIVITY AND ECOLOGICAL PLASTICITY OF PERENNIAL LOW-SPREAD FODDER CROPS IN THE CONDITIONS OF THE FOREST-STEPPE OF WESTERN SIBERIA KW parsely distributed forage crops KW yield KW green mass KW dry matter KW feed units KW protein KW ecological plasticity KW seeds JO Vestnik of Omsk SAU AU CHUPINA, M.P. AU STEPANOV, A.F. PY 2026 IS 61 PB FSBEI HE Omsk SAU