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Response to urea and ammonium nitrate fertilization in an 80-year-old Douglas-fir standAuthor(s): Richard E. Miller; Constance A. Harrington
Source: Res. Note PNW-RN-330. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 5 p.
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
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DescriptionVolume growth response to 200 Ib of nitrogen per acre applied as urea or ammonium nitrate was monitored for 4 yr in an 80-yr-old, site I, Douglas-fir stand. Fertilization increased gross total cubic growth by 20 percent over the controls. Response to urea and to ammonium nitrate was similar. The rapid volume growth on the control plots, 34 2 ft 3 per acre per year, plus the substantial increase in growth on the fertilized plots, indicate the desirability of delaying final harvest of this stand.
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CitationMiller, Richard E. ; Harrington, Constance A. 1979. Response to urea and ammonium nitrate fertilization in an 80-year-old Douglas-fir stand. Res. Note PNW-RN-330. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 5 p.
KeywordsNitrogen fertilizer response, increment (volume), urea, ammonium nitrate, silviculture, Douglas-fir, Pseudotsuga menziesii
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