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Response of Densely Stocked Loblolly Pine (Pinus taeda L.) to Applied Nitrogen and Phosphorus

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Forest productivity may be enhanced by satisfying the nutrient requirement of trees through fertilization. A field experiment was designed to study the response of densely stocked 1-yr-old loblolly pine to nitrogen and phosphorus in the presence of applied K on a Beauregard silt loam soil (fine-silty, siliceous, thermic Plinthaquic Paleudults) of the Gulf Coastal Plain. The continuous function design with three replications was used. Fertilizer P rate was based on the P adsorption characteristics of the soil. After 1 yr of growth, the response variables: height; total aboveground dry matter; foliage and wood dry matter; diameter at ground level; and N, P, and K contents were related to the rate of N and P applied by quadratic models with response surface methodology. The lack-of-fit test showed that the quadratic model was adequate in explaining the relationship between N and P applied and all the response variables except height. Fertilization with N alone on this soil had a depressing effect on yield. Growth and nutrient uptake were enhanced when both N and P were applied. The predicted N and P levels that would give maximum growth were beyond the rates of N and P tested, indicating that more time should be given to observe the full response. South. J. Appl. For. 27(3):180–189.
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Keywords: Loblolly pine; continuous function design; environmental management; fertilization; forest; forest management; forest resources; forestry; forestry research; forestry science; lack-of-fit; natural resource management; natural resources; nitrogen; phosphorus; pine plantations; potassium; response surface

Document Type: Miscellaneous

Affiliations: 1: Dept. of Agronomy, Louisiana Agric. Exp. Stn., Louisiana State University Agricultural Center, 104 M.B. Sturgis Hall, Baton Rouge, LA, 70803-2110, 2: USDA Forest Service, 2500 Shreveport Hwy, Pineville, LA, 71360,

Publication date: 2003-08-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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