Abstract:

Two treatments involving tree spacings (12 and 24 ft) within rows spaced 24 ft apart and height control (topped or not topped at 20 ft) were evaluated in 17- and 22-yr-old coast Douglas-fir (Pseudotsuga menziesii var. menziesii) seed orchards. Treatment differences for cone production were not significant because of the large tree-to-tree variation in cone production and, at one orchard, the confounding of location with treatment. Cone production in 1990 averaged slightly more than 2 bushels per tree (range 0 to 11.7 bushels). Average production per 96 linear ft of orchard row was 14.8 bushels. West. J. Appl. For. 9(1):5-7.

Document Type: Journal article

Affiliations: 1: State of Oregon, Department of Forestry, Salem, OR 97310