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Sulfur Requirements of Nitrogen Fertilized Douglas-fir

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In a series of Pacific Northwest Douglas-fir nitrogen fertilizer trials, foliage SO4-S was found to be a correct predictive index of response in 17 of the 19 stands studied, whereas using foliage nitrogen concentrations the correct prediction was obtained in only 12 stands. To obtain a tree growth response to an application of 220 kg/ha N, resulting in an increase of 0.4 percent foliage N, approximately 0.04 percent foliage SO4-S is required. As SO4-S concentrations are not routinely determined in the fertilizer project laboratories, other parameters providing potential indirect estimates of SO4-S status have been assessed. Using a combination of soil parent material and the separately measured soil nitrogen content (kg/ha), predictions of fertilizer response comparable to those using foliage SO4-S concentrations have been obtained. Trees located on soils derived from sedimentary and glacial parent materials responded to N fertilization when the soils contained less than 8,000 kg/ha N in the rooting zone whereas no trees were found to respond on soils derived from pumice (less than 2,400 kg/ha N) and basalt parent materials. In these latter cases foliar SO4-S levels were less than 0.005 percent. Forest Sci. 25:461-467.

Keywords: Pseudotsuga menziesii; fertilizer application

Document Type: Journal Article

Affiliations: College of Forest Resources, University of Washington, Seattle 98195 U.S.A.

Publication date: 1979-09-01

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

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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