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Five-Year Volume Increment From Nitrogen Fertilization in Thinned Plantations of Pole-Size Loblolly Pine

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Nitrogen was applied at 0, 112, 224, 448, and 672 kg/ha on two pole-size loblolly pine plantations in the Coastal Plain of South Carolina and at 0, 168, and 336 kg/ha on one in the Virginia Piedmont. The plantations had been thinned once and basal areas ranged from 19.9 to 23.8 m²/ha. The relation between increase in 5-year volume increment from fertilization and initial basal area (IBA) and N rate was estimated with a regression model which indicates that small variations in IBA can mask responses to fertilization. Estimated 5-year increments from 224 kg of N/ha were 14 m³ of wood for a Coastal Plain site low in total soil N, 17 m³ for a Piedmont site low in N, and 2.1 m³ on a Coastal Plain site high in N. The 672 kg/ha rate of N produced a smaller response than the 448 kg/ha rate on the Coastal Plain site low in N. On the Coastal Plain site high in N, applying 672 kg/ha N reduced volume increment. Results show that IBA must be carefully controlled in studies of stand response to N fertilization. Forest Sci. 22:85-90.

Keywords: Pinus taeda; soils

Document Type: Journal Article

Affiliations: Forester, Westvaco Corporation, Ivy, Virginia 22945

Publication date: 1976-03-01

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 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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