TY JOUR TI TRANSFORMATION OF FALLOW LANDS SOILS FERTILITY IN THE FOREST-STEPPE ZONE WITH THEIR USE DIFFERENT DIRECTIONS KW fallow land KW arable land KW forest overgrowth KW gray soils KW fertility KW spatial variation KW productivity of fallow phytomass JO Bulletin of KSAU AU Sorokina, O.A. PY 2024 IS 0 PB Krasnoyarsk State Agrarian University