Skip to Main Content
Urea fertilizer increases growth of 20-year-old, thinned Douglas-fir on poor quality siteAuthor(s): Richard E. Miller; Donald L. Reukema
Source: Res. Note PNW-RN-291. 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: View PDF (426.74 KB)
DescriptionIn 20-year-old, site V Douglas-fir in southwest Washington, fertilizing with nitrogen increased average 5-year diameter and height growth of concurrently released dominant trees by about 85 percent. There was no additional response when phosphorus, potassium, and sulfur were added with the nitrogen fertilizer. Thinning with no other treatment in this moderately stocked plantation did not increase 5-year diameter growth, and it reduced height growth by about 25 percent. Although this reduced height growth will probably be offset by increased growth in the future, managers of nitrogen deficient sites should consider fertilizing shortly before or after thinning to accelerate response to release.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationMiller, Richard E.; Reukema, Donald L. 1977. Urea fertilizer increases growth of 20-year-old, thinned Douglas-fir on poor quality site. Res. Note PNW-RN-291. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p.
KeywordsFertilizer response, height, diameter, nitrogen fertilizer response, urea, site class, thinning
- Response of a 110-year-old Douglas-fir stand to urea and ammonium nitrate fertilization
- Response of a poor-site western redcedar stand to precommercial thinning and fertilization.
- Fifteen-year results from a Grand fir-Shasta red fir spacing study.
XML: View XML