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    Author(s): Richard E. Miller; Richard L. Williamson
    Date: 1974
    Source: Res. Note PNW-RN-216. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (337.98 KB)

    Description

    In 30-year-old, Site IV Douglas-fir in southwest Oregon, fertilizing increased average 4-year basal area growth of dominant trees by 57 and 28 percent on clay loam and sandy loam soils, respectively. Fertilizing with thinning increased growth by 94 and 132 percent over untreated growth. Thinning on clay loam soil increased growth by 53 percent. Treatment did not affect height growth on either soil.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Miller, Richard E.; Williamson, Richard L. 1974. Dominant Douglas-fir respond to fertilizing and thinning in southwest Oregon. Res. Note PNW-RN-216. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p.

    Keywords

    Douglas-fir, thinnings, fertilizer response (forest tree), forest management, soil management, basal area increment, southwest Oregon

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