TY JOUR TI ON THE QUESTION OF STABILISATION OF HUMUS CONDITIONS OF ARABLE CHERNOZYOMS DUE TO PLOWING STRAW OF GRAIN CROPS KW straw KW humus state KW chernozyom lix-ivious KW mineral fertilizers KW biological activity of the soil KW mineralization KW humification JO Bulletin of KSAU AU Eryomin, D.I. AU Akhtyamova, A.A. PY 2017 IS PB Krasnoyarsk State Agrarian University