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Response of Slash Pine to Nitrogen and Phosphorus Fertilization¹

ABSTRACT

A slash pine plantation in the lower Coastal Plain of Georgia was fertilized at age 9 with 200 pounds per acre of N, 44 pounds per acre of P, and with both elements. Diameter and basal area growth response to N was obtained for each of the first 3 years following treatment, but maximum stimulation occurred the year after fertilization. Diameter growth of the largest 400 trees per acre was also significantly increased by N treatment. P supplements gave no response in the deep sandy soil. Height growth responses were not apparent.

Concentration of N in needles was increased 1 year after treatment, but by the end of the third growing season, no differences were apparent for N, P, K, and Ca content in foliage. Chemical analyses are also given for L and F layers, the latter being high in N. Neither needle lengths nor soil analyses differed between treatments after 3 years.

¹ Journal Paper No. 206 of the College Experiment Station of the University of Georgia College of Agr. Exp. Sta. The experiment reported here, installed while the co-author was Research Forester with The Monsanto Chemical Co., was conducted on lands belonging to the Langdale Co. Assistance of Langdale Company foresters, of Dr. H. F. Perkins of the University of Georgia, and of the National Plant Food Institute is acknowledged with appreciation. Presented before Div. V-A, Soil Science Society of America, Nov. 29, 1961, at St. Louis, Mo.

² Associate Professor, School of Forestry, University of Georgia, Athens; and Professor of Soils, Oregon State University, Corvallis, respectively.

Received for publication October 11, 1961. Accepted for publication April 6, 1962.