The study deals with mechanical bucking of coniferous and deciduous trees on the standing of the cable crane with tower Syncrofalke. By the standing of cable crane we gathered data of the trees which arrived whole to the harvesterhead and were then processed. We measured diameter at breast height, diameter at half length of each log, quality class by the standards SI and we assessed the length of tree top. Gathered date enable us to study accuracy of crosscutting and its economic impact on log -making, dependence between diameter at breast height and tree value, number of log derived from each treeand volume of average log, dependence between tree height and tree value, number of log derived from tree and volume of average log, share of value of individual log in value of whole tree and share of value loss, made because inaccurate crosscutting of individual log in value loss accumulated in whole three.
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