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Effects of Fertilizer Applications on Two Generations of Slash Pine¹

ABSTRACT

A series of 37 plots was established on which three formulations of fertilizer were applied at five rates to two age-classes of slash pine growing in Florida. The fertilizer caused increases in the nutrient contents of needles and branches of the younger trees and of cones and seeds in the older trees. Basal-area growth was increased as much as 32% in the older trees. Fertilizer treatments had no significant effect on cone length but produced heavier seeds. When these seeds were germinated in the greenhouse, they produced larger more vigorous seedlings with higher contents of nitrogen, phosphorus and potassium than did seeds produced on control trees.

¹ Contribution from the School of Forestry, Yale University, New Haven, Conn. Presented before Div. V-A, Soil Science Society of America, Nov. 18, 1959, at Cincinnati, Ohio.

² Assistant Professor of Forest Genetics and Assistant Professor of Forest Soils. The authors acknowledge with thanks, the cooperation of the Southeastern Forest Exp. Sta., U. S. Forest Service, whose staff members collected the samples for this study.

Received for publication December 10, 1959. Accepted for publication March 2, 1960.