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Differences in Cone Numbers, Lengths, and Cut-Counts in the Crowns of Young Open-Grown Douglas-Fir

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Twenty open-grown Douglas-fir (Psedotsuga menziesii [Mirb.] Franco), between 10 and 39 years old b.h., were studied in 1961 for the distribution of cones and branches. The trees were widely distributed throughout western Oregon and Washington and had individual crops ranging from 151 to 6,000 cones. Cone-bearing portions of the crowns were divided into thirds vertically and into N, E, S, W quarters radially. The cones and branches in each of the 12 portions were counted and two cones from each were sliced and a "cut-count" made. Cone .numbers, lengths, and cut-counts were greatest at the distal position on the branches in the upper and middle south portions of the crown. Internodal branches accounted for 9.1 percent of the cone crop and generally had shorter cones; the latter had lower cut-counts than did cones of the whorl branches.
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Document Type: Journal Article

Affiliations: Forest Entomologist, Forestry Research Center, Weyerhaeuser Company, Centralia, Wash.

Publication date: 1964-06-01

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