The research presented below analyses the differences in the location of knots and injuries as well as the size of injuries on the stems of Norway spruce from different regions of Poland. The research was conducted on 32 plots located within two ranges of the occurrence of spruce in Poland: the north-eastern range and the south-western one. On the selected spruce trees, the researchers measured the height of location of knots and injuries as well as injury sizes. The analyses revealed significant differences in: the height of location of knots and overgrown injuries and the size of injuries in trees from different regions and ranges of occurrence while no such differences were found in the height of location of open injuries.
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