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Title: Response of a 110-year-old Douglas-fir stand to urea and ammonium nitrate fertilization
Author: Harrington, Constance A.; Miller, Richard E.;
Source: Res. Note PNW-RN-336. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p
Publication Series: Research Note (RN)
Description: Basal area response to 150 pounds of nitrogen per acre applied as urea or ammonium nitrate was monitored on 1/5-acre plots for 4 years in a recently thinned, 110-year-old, site II, Douglas-fir stand. Nitrogen fertilization significantly increased growth. Basal area increment was increased 59 percent over the controls by ammonium nitrate and 37 percent by urea. The difference in response between urea and ammonium nitrate was statistically significant. Crown class had a highly significant influence on basal area growth of individual trees; however, the increases in growth due to fertilization were not significantly different by crown class.
Keywords: Nitrogen fertilizer response, increment (basal area), urea, ammonium nitrate, Douglas-fir, Pseudotsuga menziesii
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Harrington, Constance A.; Miller, Richard E. 1979. Response of a 110-year-old Douglas-fir stand to urea and ammonium nitrate fertilization. Res. Note PNW-RN-336. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p.
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