%0 Journal Article %T Rationale parameters of working bodies of tillers with variable angles of working surfaces %A Makarenko, A.N. %K soil particles, the working surface, working body %J Actual directions of scientific researches of the XXI century: theory and practice %D 2014 %N 2 %P 4 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov