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Analysis of Differences in Height Growth among Populations in a Nursery Selection Study of Douglas-Fir

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Abstract:

Douglas-fir seedlings selected for superior height and branchiness were outplanted and tested for height growth performance against control seedlings representing the nursery population. Analyses are reported of height to plantation age of 9 years. Seedlings with superior height at planting maintained height advantage, but did not exhibit greater growth rate at height than control seedlings. Seedlings with greater branchiness grew faster early, the height advantage persisted, but the growth rate advantage did not. The primary advantage to both selection criteria is shorter time to 76.2 cm (30 inches) height, this representing virtual escape from animal damage and vegetative competition. Height at 5 years past 76.2 cm showed no significant differences due to either factor. It is suspected that the differences in nursery performance, on which the selection was based, are cultural rather than genetic. Forest Sci. 24:497-509.

Keywords: Mass selection; Pseudotsuga menziesii; growth trajectory; performance variable; relative growth; superseedlings

Document Type: Journal Article

Affiliations: Professor of Forest Genetics, Department of Forest Science, School of Forestry, Oregon State University, Corvallis, OR 97331

Publication date: December 1, 1978

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