TY CONF TI NITRATE CONTENT IN POTATO GROWING ON DIFFERENT CHERNOZEM SUBTYPES OF VORONEZH REGION KW chernozem soils KW product quality KW food security KW nitrates KW agriculture KW agrocenosis KW personal subsidiary plots JO Reproduction, monitoring and protection of natural, natural-anthropogenic and anthropogenic landscapes AU Solovieva, A.A. AU Gorbunova, Y.S. PY 2022 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov