Abstract:

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.

Keywords: Pseudotsuga menziesii; genetics; tree improvement; nutrition; family x fertilizer interaction

Document Type: Journal article

Affiliations: 1: Mathematical Statistician, USDA Forest Service, Forestry Sciences Laboratory, 3200 Jefferson Way, Corvallis, OR 97331