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Long-term Response to Phosphorus Fertilization on Selected Southeastern Coastal Plain Soils¹

ABSTRACT

Significant response in height, diameter, basal area, and volume growth to phosphorus (P) fertilization at time of planting lasted 17 to 20 years on a variety of sites in northern and western Florida. Ground rock phosphate and the more soluble ordinary superphosphate were equally effective P sources. Comparing the residual fertilizer P in the soil to a long-term response of slash pine (Pinus elliottii Engelm. var elliottii) helped explain lack of differences in effectiveness of P sources. The largest long-term slash pine responses were apparent on a poorly drained Ultisol and Inceptisol while the Spodosols were more variable in their response. There were no P responses on well-to-excessively-drained Entisols.

¹ Florida Agric. Exp. Stn. Journal Series no. 3188.

² Professor and Assistant Professor of Forest Soils, respectively, Soil Science Dep., Univ. of Florida, Gainesville, FL 32611.

Received for publication July 17, 1981. Accepted for publication January 4, 1982.

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