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

Comparison of Plot Designs for Short-Term Genetic Trials

Consistant reports from retrospective early genetic trials suggest height or height increment measured in closely-spaced trials can be used to screen families by age 3- years. Closely-spaced trials come into intense tree-to-tree competition and competitive stress may bias selection and parameter estimates. In our closely-spaced plot design study, bias from inter-family competition was not apparent, even when families from different seed sources were interplanted. Block plots were found to be unnecessary, row and multiple singletree plots provided similar mean family rankings and multiple single-tree plots appeared slightly more efficient in shortterm genetic trials.

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Author(s): Gerald A. Tuskan, Claire G. Williams

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1989

Section: Concurrent Session 1B