WEEKLY RADIAL INCREMENT OF BALSAM FIR IN QUEBEC AS RELATED TO McLINTOCK'S TREE CLASSIFICATION

Radial increments of 38 balsam fir trees (Abies balsamea (L.) Mill.) differing in height, crown class and vigour, were studied to determine if their correlation with the McLintock classification was better than that with either total height, crown class, vigour class or crown ratio. Measurements at weekly intervals during the 1961 growing season have shown the superiority of the McLintock tree classification over the other four. It seems, therefore, that the interaction of the factors involved in McLintock classification is essentially valid even for very short predictions.