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Effect of Family and Nitrogen Fertilizer on Growth and Foliar Nutrients of Douglas-fir Saplings

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Family x fertilizer-interactions were evaluated in a split-plot experiment involving 12 open-pollinated families of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). The fertilizer treatment was applied when trees were 12 years of age, and response was measured as cumulative volume growth during the next 4 years. Volume growth varied among families and was increased by an average of 7 percent by application of 224 kg ha-1 N as urea. Foliar concentrations of some nutrients also differed significantly (P ≤ 0.05) among families and between fertilizer treatments. The family x fertilizer interaction was not significant for any growth or foliar nutrient variable. Forest Sci. 32:643-652.
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Keywords: Pseudotsuga menziesii; family x fertilizer interaction; genetics; nutrition; tree improvement

Document Type: Journal Article

Affiliations: Mathematical Statistician, USDA Forest Service, Forestry Sciences Laboratory, 3200 Jefferson Way, Corvallis, OR 97331

Publication date: 01 September 1986

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