TY JOUR TI CROP ROTATION LINKS INFLUENCE ON THE ORGANIC MATTER REGIME OF SOUTHERN CHERNOZEM IN STEPPE AGROCENOSIS KW humus KW humification KW humus mineralization KW soil fertility KW plant residues KW green manure KW crop rotation link KW steppe zone JO Bulletin of KSAU AU Khalin, A.V. AU Fedyunin, S.A. AU Nesterenko, M.Y. AU Gintsov, D.A. PY 2025 IS 0 PB Krasnoyarsk State Agrarian University