Productivity and Working Time Structure of Timber Forwarding in Flatland Thinned Pine Stand with the Use of Farm Tractors

Farm tractors are very popular in Poland and other European countries. When coupled with trailers equipped a crane grapple, they also used, especially easily accessible, flat terrain, for timber forwarding the CTL (Cut-to-Length) method. A comparative analysis of working time productivity was performed on two units, consisting farm tractor Ursus Farma trailer load capacity 6 tons, as well Valtra Valmet Palms 9 which forwarded wood mature pine stand. An done 64 work cycles an average volume 2.1 m3 former unit, 36 7.9 latter. The structure both units similar. During work, operators spent most time, i.e. over 35%, loading timber, then travelling unloading. lowest share cycle, around 5%, belonged to without forwarding. unit amounted 33 minutes about twice shorter than that amounting minutes. distance covered during loaded travel only factor had significant influence duration cycles. coefficients correlation between these variables were 0.56–0.76. net obtained operating 7.5 m3×PMH-1 almost high 3.8 m3×PMH-1. For multiple regression models developed, is calculated based transported travel.