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Effects of Fertilization, Irrigation, and Cover Cropping on Flowering and on Nitrogen and Soluble Sugar Composition of Slash Pine

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Effects of nitrogen fertilization, irrigation, and cover-cropping vs disking on nitrogen and soluble sugar composition and on flowering of eight clones of slash pine (Pinus elliottii Engelm.) were studied. Fertilizing with ammonium nitrate increased free arginine, total free amino acids, and total nitrogen of the twigs; and total nitrogen of the needles. Fertilizing also doubled female flower production. Irrigation decreased total foliar nitrogen, and increased male flowering as an interaction with clones. Cover-cropping with a legume (hairy indigo) increased arginine content and decreased soluble sugar content of the twigs, and interacted with irrigation in affecting female flowering. There were highly significant differences among clones in female and male flowering, all measures of nitrogen content, and soluble sugar content. There were also several significant interactions between clones and treatments in affecting flowering and nitrogen composition.
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Document Type: Journal Article

Affiliations: Research Forester, Soils and Fertilizer Research Branch, Tennessee Valley Authority, Muscle Shoals, Ala.

Publication date: 1968-06-01

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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