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CEPA in Liquid Sulfuric Acid Increases Oleoresin Yields

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Liquid sulfuric acid solutions of 12.5, 25.0, and 50% by weight were tested in combination with 0, 2.5, 5.0, 10.0, and 15.0% 2-chloroethylphosphonic acid (CEPA) for increasing oleoresin yield in slash (Pinus elliottii) and longleaf (P. palustris) pines. Maximum oleoresin yields of 262 g/cm diameter breast height (dbh) were obtained in 23- to 25-year-old clonal slash pines from 50% sulfuric acid plus 15% CEPA, a 20% increase over the slash pine control trees. In a natural stand of longleaf pines over 60 years old, maximum oleoresin yields of 297 g/cm dbh were obtained from 50% sulfuric acid plus 10% CEPA--a 30% increase over the longleaf pine control trees. The addition of CEPA to any sulfuric acid concentration always increased yields and increasing sulfuric acid concentrations without CEPA always increased yields. The sulfuric acid and CEPA effects were both significant but no interaction between them was detected for either slash or longleaf pines. Highly significant differences in yield were found among the clones.

Document Type: Journal Article

Affiliations: USDA Forest Service, Southeastern Forest Experiment Station, PO Box 70, Olustee, Fl 32072

Publication date: 1985-08-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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