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