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Response of Slash Pine (Pinus elliottii Engelm. var. elliottii) to Phosphorus in Sandy Soils¹

ABSTRACT

Rock phosphate or superphosphate band applied to slash pine about 1 year after transplanting resulted in significant height and diameter increases in 5 of 8 experiments, 3 to 5 years after treatment. However, response occurred only on somewhat poorly to poorly drained (flatwood) sands of the Groundwater Podzol and Humic Gley groups. While 50 lb N/acre applied alone usually suppressed tree growth, when applied in combination with 35 lb P/acre, it resulted in additional response. After the third year, 140 lb P/acre from rock phosphate gave about as good results as 35 lb P/acre from superphosphate. The optimum level of tissue P in current needles of 3- to 5-year-old trees was approximately 0.10%. Total soil P did not appear to be of much value for predicting response of young pine trees to added P. However, the amount of P extracted from unfertilized surface soil with 1.0N NH₄OAc (pH 4.8) was negatively correlated with response to phosphate applications on flatwoods sands. Curvilinear regression lines in relation to tree response to varying levels of fertilizer P with amounts of soil extractable P were constructed.

¹ Contribution from the Department of Soils, University of Florida, Gainesville. Florida Agr. Exp. Sta. Journal Series no. 2259.

² Soils Technologist and former Graduate Assistant, now Assistant Soil Scientist, respectively.

Received for publication November 10, 1965. Accepted for publication April 22, 1966.