Comparison of the half-sib families of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in the trial in the Manowo Forest District

Douglas-fir is the most important introduced forest tree species in Poland. It is included into the frame of the breeding program that needs to test the selected objects. In the described trial the families of 14 plus trees are being tested. They are half-sib families from the open pollination. The significant differences between the families were stated in case of the diameter at the breast height and the height. The evaluation of the families being tested was carried out.