TY CONF TI STATE OF FERTILITY OF ARABLE SOILS IN THE TAIGA-FOREST ZONE OF THE OMSK REGION KW humus KW aggregate composition KW pH KW exchangeable cations KW fertility JO «PROBLEMS OF SOIL FERTILITY IN MODERN AGRICULTURE» AU Aksenova, Y.V. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS