TY JOUR TI Features of calculation of the productivity of motoaggregates in forest nurseries KW walking tractor KW productivity KW operator KW charges of energy of man. JO Actual directions of scientific researches of the XXI century: theory and practice AU Ovsyannikov, S.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov