Nutrient Analysis Problems in Douglas-fir Christmas Trees
The results of an Oregon State University affiliated two year study on the nutrient levels of Douglas-fir trees on Oregon Christmas tree plantations. Samples were taken from trees four and five years old in the Corvallis, OR and Willamette Valley areas.
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Spring 1985 Vol. 9, Issue 1 Pages 18-19
W.M. Proebsting Horticulture Department Oregon State University Corvallis, OR 97331