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Soil Phosphorus Level Adequate for Growth of Ocala Sand Pine Seedlings, A Greenhouse Evaluation¹

ABSTRACT

A greenhouse study was conducted to determine the level of soil P adequate for satisfactory growth of Ocala sand pine (Pinus clausa (Chapm.) Vasey) seedlings. Various quantities of Lakeland sand with low and high P contents were blended to provide soil mixtures with a range of available P. Ocala sand pine seedlings were grown in these mixtures for 10 months. On the basis of the seedlings' dry matter production, the level of soil P adequate for satisfactory growth of Ocala sand pine is in the neighborhood of 1 ppm available [NH₄OAc (pH 4.8)-extractable] P. Seedlings growing in soils containing < 1 ppm available P showed a marked reduction in dry weight. Tissue analyses indicate that concentrations of foliar P of < 0.15% may denote a deficiency of available soil P.

¹ Contribution from the Southeastern Forest Exp. Sta., Forest Serv., USDA, Asheville, N.C. 28802.

² Research Soil Scientist and Principal Soil Scientist, respectively, Southern and Southeastern Forest Exp. Stations, Forest Serv., USDA, Stoneville, Miss., and Marianna, Fla.

Received for publication September 9, 1971. Accepted for publication April 26, 1972.