Skip to Main Content
Effect of operational fertilization on foliar nutritent content and growth of young Douglas-fir and Pacific silver fir.Author(s): P.H. Cochran; W. Lopushinsky; P.D. McColley
Source: Res. Note PNW-RN-445. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
Download Publication (394 KB)
DescriptionNitrogen concentration in current year needles of Pacific silver fir (Abies amabilis Dougl. ex Forbes) showed a significant (P<0.05) 1.9-fold increase after fertilization with sulfated urea (40-0-0-6), compared with a nonsignificant 1.3-fold increase in Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and a significant (P<0.05) 2.5-fold increase in bracken fern (Pteridium aquilinum (L.) Kuhn.). Nitrogen concentration in needles of unfertilized Pacific silver fir (0.99 percent) indicated a deficiency of nitrogen, whereas the concentration in Douglas-fir (1.35 percent) was above threshold levels. Total sulfur concentration in needles ranged from 0.05 to 0.09 per-cent for both species, with no significant effect of fertilization. Fertilization resulted in increased needle surface area for Pacific silver fir. Diameter growth of the trees, stand basal area growth, and volume growth were all increased by fertilization. More trees on the fertilized plots had broken tops, and rates of height growth for undamaged trees were greater for the fertilized plots; but the difference attributed to fertilization was not quite significant at the 5-percent level of probability.
- Visit PNW's Publication Request Page to request a hard copy of this publication.
- 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.
CitationCochran, P.H.; Lopushinsky, W.; McColley, P.D. 1986. Effect of operational fertilization on foliar nutritent content and growth of young Douglas-fir and Pacific silver fir. Res. Note PNW-RN-445. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p
KeywordsFoliar analysis, nitrogen fertilizer response, increment, Pacific silver fir, Douglas-fir
- Reforestation trials and secondary succession with three levels of overstory shade in the Grand Fir Mosaic ecosystem
- Supplemental treatments to aid planted Douglas-fir in dense bracken fern
- The Grand Fir Mosaic Ecosystem -- History and Management Impacts
XML: View XML