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Nitrogen and Potassium Fertilization Of Loblolly Pine on a South Carolina Piedmont Soil

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Potassium fertilizer at the rate of 120 and 240 lb K per acre was applied to 7-year-old, slow-growing loblolly pine (Pinus taeda L.) in the South Carolina Piedmont. Treatment increased foliar K from about 0.25 percent to 0.50 percent but did not affect growth. Two years after fertilization with nitrogen at 200 lb per acre, height and diameter growth rate had increased 25 percent and 35 percent, respectively. Nitrogen percentage in the needles and needle weight were also increased. Interactions between position on the slope, nitrogen percentage in needles, and growth were indicated. Potassium fertilization decreased Ca and Mg concentrations in needles, whereas N decreased P, Ca, Mg, Mn, Zn, and Al. The effects were not sufficiently great to cause a deficiency or imbalance in nutrition. Forest Sci. 16: 172-176.

Keywords: Pinus taeda; foliar analysis

Document Type: Journal Article

Affiliations: Principal Soil Scientist, Forestry Sciences Laboratory, Southeastern Forest Exp Sta., Forest Service, U.S. Dep. of Agr., Research Triangle Park, N. C. 27709

Publication date: 1970-06-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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