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Predicting Fertilizer Response of Loblolly Pine Using Foliar and Needle-Fall Nutrients Sampled in Different Seasons

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Nitrogen (N) and phosphorus (P) concentrations in loblolly pine (Pinus taeda) foliage and needle-fall were determined five times during 1979 on ten fertilizer trials installed between 1971 and 1973. Bole volume responses to fertilizers were regressed on initial stand basal area, and the residual errors were used as dependent variables in regressions with the nutrient variables. The only sampling period during which the N response residuals had a significant relation to foliar nutrients was early fall. The needle-fall N/P ratio was significantly related to the N response residuals in late winter, late spring, and early fall. Phosphorus response residuals were significantly related to foliar nutrients during all sampling periods and to needle-fall N/P in all sampling periods except late winter. The maximum R², 0.73, was for the regression of the P response residuals versus a foliar N/P ratio in late spring. The N + P response residuals were not significantly related to foliar or needle-fall nutrients. For. Sci. 34(3):698-707.

Keywords: Nitrogen; Pinus taeda; basal area; nutrient ratios; phosphorus

Document Type: Journal Article

Affiliations: Director, NCSFNC, North Carolina State University, Raleigh, N.C. 27695

Publication date: September 1, 1988

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  • 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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