TY JOUR TI FALLOW LANDS DEMUTATION AND BIOPRODUCTIVITY UNDER KHAKASS HILLY STEPPE CONDITIONS KW fallow land KW slope position KW demutation KW soil fertility KW phytomass KW mortmass KW bioproductivity. JO Bulletin of KSAU AU Kut'kina, N.V. AU Eremina, I.G. PY 2021 IS 0 PB Krasnoyarsk State Agrarian University