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Long-term Growth Response of Douglas-fir to Ammonium Nitrate Fertilizer

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The effect of a single application of ammonium nitrate fertilizer on diameter, height, and volume growth of a Site IV plantation of Pseudotsuga menziesii was measured repeatedly during a 15-year period. Fertilizer dosages of 157, 314, and 471 kg N/ha increased gross volume growth during the 15-year period by an average of 51, 88, and 111 percent, respectively (67, 116, and 146 m³/ha). Quadratic equations best described the relationship between fertilizer dosage and gross and net volume growth during the entire period and during three intermediate periods. Volume growth on fertilized plots exceeded that on unfertilized plots in all periods. Response to all N dosages did not change significantly during the 15-year period of observation. The positive, long-term effect of fertilizer on stand growth is attributed both to improved tree nutrition and to secondary effects of increased tree growth on stand structure. Forest Sci. 29:127-137.

Keywords: Pseudotsuga menziesii; forest fertilization; silviculture

Document Type: Journal Article

Affiliations: Professor, Department of Forest Science, Oregon State University, Corvallis, Oregon 97331

Publication date: 1983-03-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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