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Optimum Paraquat Treatments for Inducing Resin-Soaking in Slash and Loblolly Pines

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Slash pine (Pinus elliottii Engelm. var elliottii) trees near Olustee, Florida, and loblolly pine (Pinus taeda L.) trees on the Savannah River Plant near Aiken, South Carolina, were treated with five concentrations of paraquat solution at three application volumes and by two methods to determine the optimum combination of concentration and volume for lightwood production in each species. Tree mortality was considerably higher with the tree injector method than with the bark-streak method. When tree mortality and yield are both considered, the optimum treatment for loblolly pine is 0.8 ml per injection with 6-percent paraquat or 0.5 ml of 7-percent paraquat per 25 mm of bark-streak wound. In slash pine trees, injections of 0.6 to 1 ml of 2-percent paraquat should give acceptable yields.
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Document Type: Journal Article

Affiliations: Research Forester, Southeastern Forest Experiment Station, USDA Forest Service, Naval Stores and Timber Production Laboratory, Olustee, Florida

Publication date: 1983-02-01

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