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Growth and Wood Properties of Loblolly Pine on a Piedmont Subsoil as Influenced by Early Fertilization¹

ABSTRACT

A field study was conducted on an impoverished "borrow" area in the South Carolina Piedmont to determine the response of loblolly pine (Pinus taeda L.) seedlings to various fertilizer treatments. Treatments were applied for 4 consecutive years to individual seedlings outplanted for 2 years. At the end of the fertilization period, seedlings receiving N, either alone or in combination with P and/or K, were significantly taller than seedlings in other treatments. Ten years after the last fertilizer application, trees treated with N, with or without other nutrients, averaged 0.6–1.6 m taller and 23–30% larger in diameter than control trees. Merchantable tree volume was at least doubled by N application. Phosphorus and potassium, at the rates used, had no effect on growth. Percentage latewood and wood specific gravity were not altered by fertilization.

¹ Contribution from the Dep. of Forestry, Clemson Univ., Clemson, South Carolina 29631. Presented before Div. S-7, Soil Sci. Soc. Amer., Nov. 1, 1972, at Miami, Fla.

² Associate Professor, Clemson Univ.; Principal Wood Scientist, FS, USDA, and Visiting Assistant Professor, Clemson Univ.; and Associate Professor, Clemson Univ., Clemson, S.C. 29631, respectively.

Received for publication January 15, 1973. Accepted for publication June 21, 1973.