TY JOUR TI SOIL TOXICITY DEPENDING ON THE MASS AND CHEMICAL COMPOSITION OF PLANT RESIDUES KW green manure KW soil toxicity KW methods of increasing soil fertility KW sunflower KW mass of plant residues KW chemical composition of plant residues JO Vestnik of Omsk SAU AU NESMEYANOVA, M.A. PY 2025 IS 57 PB FSBEI HE Omsk SAU