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Effects and Adjustments of Competition Bias in Progeny Trials with Single-Tree Plots

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A competition model based on the height difference between a subject tree and its neighbors was used to adjust annual growth data (age 1-5) in a close-spaced single tree plot trial of 25 open-pollinated Pinus banksiana progenies. Competition effects in tree height, basal area, and volume growth were estimated within each of eight classes of dominated oppression. This procedure allowed a differential adjustment of family performances of their large plot expectations. It is limited to the absence of competition effects on height growth. Response to competition was the same in all families. Variance components and heritability estimates of basal area and stem volume were inordinately inflated by competition. For. Sci. 35(2):532-547.

Keywords: Pinus banksiana; competition; experimental design; heritability; jack pine; variance component

Document Type: Journal Article

Affiliations: Research Scientist, Petawawa National Forestry Institute, Chalk River, Ontario K0J 1J0 Canada

Publication date: June 1, 1989

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