TY JOUR TI Fertility chernozem south and yield of winter wheat under different systems of fertilizers and soil treatment KW southern black soil KW fertility KW humus KW P2O5 KW exchangeable potassium KW the yield of winter wheat. JO Actual directions of scientific researches of the XXI century: theory and practice AU Shevchenko, I.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov