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Genetic Gain for Five Traits in Black Walnut

From data gathered on two 3-year-old black walnut plantations, selection by height, diameter, or straight height generally resulted in genetic gain for all three of these traits, while date of leaf flush was set back slightly. Little or no increase was observed in the number of leaders competing for dominance when selection was based on growth parameters. Family selection gave greater expected genetic gains in the next generation than either provenance or mass selection. Maximum gain will likely result from using a combination of selection methods. Additional keywords : Selection methods, Juglans nigra, tree growth, heritability, tree form.


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Author(s): James M. Kucera, Calvin F. Bey, Fan H. Kung

Publication: Tree Improvement and Genetics - Central States Forest Tree Improvement Conference - 1974