TY CONF TI AGROECOLOGICAL ASSESSMENT OF THE BALANCE OF HUMUS AND NUTRIENT ELEMENTS IN SOILS OF THE NON-CHERNOZEM ZONE KW humus KW balance KW nutrients KW agroecosystems KW sustainability KW agroecological groups JO «PROBLEMS OF SOIL FERTILITY IN MODERN AGRICULTURE» AU Samofalova, I.A. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS