Response to urea and ammonium nitrate fertilization in an 80-year-old Douglas-fir stand

Richard E. Miller; Constance A. Harrington

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Response to urea and ammonium nitrate fertilization in an 80-year-old Douglas-fir stand

Informally Refereed

Authors:

Richard E. Miller, Constance A. Harrington

Year:

1979

Type:

Research Note

Station:

Pacific Northwest Research Station

Source:

Res. Note PNW-RN-330. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 5 p.

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Abstract

Volume 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.

Keywords

Nitrogen fertilizer response, increment (volume), urea, ammonium nitrate, silviculture, Douglas-fir, Pseudotsuga menziesii

Citation

Miller, 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.