TY CONF TI SOME TECHNIQUES FOR IMPROVING OLD-AGE HAYMAKING IN THE FOREST-STEPPE OF WESTERN SIBERIA KW yield KW old-age haymaking KW botanical composition KW herbage KW productivity KW perennial legumes JO «PROBLEMS OF SOIL FERTILITY IN MODERN AGRICULTURE» AU Tyuryukov, A.G. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS