TY JOUR TI Modern development of designs of tree planting machines abroad KW tree planting machine KW seedling KW continuous planting KW spot landing KW landing mechanism KW automation KW development JO Forestry Engineering Journal AU Popov, I.. PY 2014 IS 4 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov