Dominant Douglas-fir respond to fertilizing and thinning in southwest Oregon

Richard E. Miller; Richard L. Williamson

Treesearch

Dominant Douglas-fir respond to fertilizing and thinning in southwest Oregon

Informally Refereed

Authors:

Richard E. Miller, Richard L. Williamson

Year:

1974

Type:

Research Note

Station:

Pacific Northwest Research Station

Source:

Res. Note PNW-RN-216. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p

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Download (PDF 346 KB): https://research.fs.usda.gov/download/treesearch/40642.pdf

Abstract

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.

Keywords

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

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.