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

Genetics of pure and mixed family plot yields in loblolly pine

Mixed and pure family plots of 10 half-sib families of loblolly pine (Pinus taeda L.) were planted in replicated experiments at two spacings on two sites in south Mississippi and Louisiana. Plots sizes were 70 trees (10 x 7 tree blocks) with three complete replications per spacing per site. Tree spacings were 1 x 2 and 2 x 2 meters (~2000 and ~1000 TPA, respectively) and individual tree measurements were made at ages 5, 10 and 15 years. Mixed plots consisted of paired families randomized in 75/25 and 25/75 ratios of trees planted as well as all families in randomized rows and all families in random mixes.

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Author(s): C. Dana Nelson