TY JOUR TI ENVIRONMENTAL CONDITION AND STABILITY BIOLOGICAL PRODUCTIVITY OF AGRO ECOSYSTEMS WITH SUNFLOWER CROPS IN CONDITIONS OF HIGH ANTHROPOGENIC LOAD KW ecology KW anthropogenic pressures KW ecosystem pollution. JO Voronezh Scientific-Technical Bulletin AU Vysotskaya, E.. AU Krekoten, M.. PY 2015 IS 4 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov