TY CONF TI CHANGES IN STAVROPOL CHERNOZEMS WHEN THEY ARE INVOLVED IN AGRICULTURAL USE KW chernozems KW hardsetting KW weathering KW organic matter KW acidification KW alkalinization KW soil depletion KW flooding JO «PROBLEMS OF SOIL FERTILITY IN MODERN AGRICULTURE» AU Chovrebov, V.S. AU Lysenko, V.Y. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS