Title: Effects of soil and foliar applications of nitrogen fertilizers on a 20-year-old Douglas-fir stand
Author: Miller, Richard E.; Wert, Steve.
Source: Res. Note PNW-RN-329. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 12 p
Station ID: RN-PNW-329
Description: We compared growth and cone production of Douglas-fir treated 4 years earlier with ISO pounds N per acre applied as urea prill by hand and as a 32-percent N solution applied by helicopter. Nitrogen fertilization increased growth by 3 88 ft per acre during the 4 years after treatment; this 3S-percent gain was similar for both soil (prill) and foliar (solution) applications. Although cone production on the prill-treated plots averaged twofold to fourfold greater than on the control plots, these differences were not statistically significant.
Keywords: Nitrogen fertilizer response, fertilizer applications, cone production, Douglas-fir, Pseudotsuga menziesii
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Miller, Richard E.; Wert, Steve. 1979. Effects of soil and foliar applications of nitrogen fertilizers on a 20-year-old Douglas-fir stand. Res. Note PNW-RN-329. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 12 p.