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U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Influence Of Family And Spacing On Juvenilelog Quality Of Loblolly Pine

Eight selected North Carolina families (based on growth rate and crown size from prior progeny tests) and one local unselected seed source were tested for juvenile log quality in a 10-year-old progeny test at three spacings in northeast Mississippi. The traits used to distinguish log quality were: sweep, number of limbs, average limb diameter, average size of largest branch, height to base of live crown, and form class. The North Carolina families exhibited significantly higher quality characteristics for all traits when compared to the local seed source. Differences were found among the eight selected families for all of the log quality traits except number of limbs. Spacing-by-family interactions were observed for average limb diameter. Interactions were associated with (a) smaller family differences at the closer spacing and (b) some large family rank changes between spacings. It was concluded that selection for fast-grown, small-crown families in North Carolina was effective in improving juvenile log quality in Mississippi, especially in plantations grown at wide spacings (8 x 8 ft. or greater).


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Author(s): J. B. Campbell, Samuel B. Land, Jr., Howard W. Duzan, Jr.

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1995