Urea fertilizer increases growth of 20-year-old, thinned Douglas-fir on a poor quality site
By: by Richard E. Miller and Donald L. Reukema
Contributors: Reukema, Donald L.; Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: USDA Forest Service research note PNW -- 291; USDA Forest Service research note PNW -- 291.
Publisher: Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Published: 1977
Place of publication: Portland, Or
Language: eng
Subjects: Growth; Forest soils; Douglas fir; Urea as fertilizer; Fertilization
Notes: Caption title.

"February 1977."

Includes bibliographical references (p. 8).