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Effects of Loblolly Pine Fertilization on a Piedmont Soil: Growth, Foliar Composition, and Soil Nutrients 10 Years after Establishment¹

ABSTRACT

A field study was conducted in Virginia on an infertile, upland soil in the Piedmont area to determine the response of loblolly pine (Pinus taeda L.) to surface applications of N, two phosphatic fertilizers, and dolomitic limestone. No differences in survival or growth were obtained 10 years after planting. Phosphate increased competition from fireweed (Erechtites hieracifolia) so severely the first year that height growth was significantly reduced, and the effect persisted through the second year. The P content of the foliage was increased by phosphate, while lime increased the Mg content and decreased the Mn content. A high rate of rock phosphate also decreased the Mn content of the foliage. The N, K, Ca, Cu, and Zn contents of the foliage were unaffected by fertilization or liming. The P content of the foliage did not correlate closely with tests of available P in the soil nor did foliar Ca correlate with available Ca in the soil.

¹ Contribution from Research Div., Virginia Polytech. Inst. and State Univ., Departments of Agronomy, and Forestry and Wildlife, Blacksburg, Va.

² Assistant Professors of Agronomy and Assistant Professor of Forestry and Wildlife, respectively.

Received for publication January 5, 1970. Accepted for publication May 1, 1970.