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The Effects of Nitrogen and Drought on Loblolly Pine Seedlings--I. Growth and Composition

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Pinus taeda L. seedlings were grown at varying concentrations of nitrogen in sand culture under normal and droughty conditions. The optimum supply concentration compared favorably with that determined by Fowells and Krauss in 1959 (Forest Science 5:95-112). However, comparisons of the two studies indicate that frequency with which the solution is applied is important at concentrations above the optimum. Mortality, which may possibly be due to ammonium toxicity, was encountered. Drought resistance, expressed as the ability to endure drought and to recover with a minimum of damage to the plant itself, especially with respect to the amount of growth, was related to the level of nitrogen nutrition. Although the effect of drought on growth was least in nitrogen deficient seedlings, the seedling growth was already at a level so low as to render this decrease of no practical value. Plants grown at nitrogen concentrations that were optimum under normal moisture conditions proved to be the most drought resistant. Nitrogen concentrations above optimum reduced drought resistance.
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Document Type: Journal Article

Affiliations: James B. Duke Professor of Botany, Duke University, at Durham, N.C.

Publication date: 1964-06-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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