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Specific gravity relative to characteristics of annual rings in loblolly pine

Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory
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SPECIFIC GRAVITY RELATIVE TO CHARACTERISTICS CU ANNUAL RINGS IN LOBLOLLY PINE June 1954 (No. 198 UNITED STATES (DEPARTMENT OF AGRICULTURE aOREST SERVICE FOREST PRODUCTS LABORATORY Madison 5, Wisconsin In Cooperation with the University of Wisconsin SPECIFIC GRAVITY RELATIVE TO CHARACTERISTICS OF ANNUAL RINGS IN LOBLOLLY PINE By MAXON Y. PILLOW, Technologist Forest Products Laboratory, 1- Forest Service U. S. Department of Agriculture Introduction Variations in specific gravity of loblolly pine were studied in relation to the physical or structural features of the annual rings and their age from the pith at different heights in the trees. The material origi-' nated on the Crossett Experimental Forest in Arkansas in a second-growth stand of trees 30 to 35 years old. As part of a comprehensive program now in progress at the Forest Products Laboratory to determine the relationship of growth rates to density and fiber structure, basic in- formation was sought on the relationship between the anatomy of the wood and its specific gravity. Second-growth loblolly's together with other southern yellow pines, supplies large amounts of construction lumber and pulpwood. Strength properties of this lumber and the yields of pulp are intimately related to variations in specific gravity of the wood. The immediate objective was to evaluate variations in specific gravity in relation to age from the pith, width of the annual rings, and the percentage of summerwood. These physical features tend to vary with the growth rates of the trees, which, in turn, are affected by silvicultural treatment of the environment. Basic information on tree growth, as it relates to the structure and properties of the wood, is essential to any attempt to improve the over- all quality of southern pine. Such information may also be used in genetical research to evaluate exceptional or outstanding forest trees. 1Maintained at Madison, Wis., in cooperation with the University of Wisconsin. Rept. No. 1989 -1-

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