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    Nursery root and shoot measurements and annual height, basal diameter and survival data for the 5 years after outplanting were used to describe black walnut growth variation in southern Illinois. At age 5 sapling height narrow-sense heritability was found to be 0.49 for 131 open-pollinated families from across the black walnut comercial range. Greatest height and diameter growth was from previously identified provenances within 200 miles south of the planting site; local sources also provided good results. Although the largest seedlings in the nursery tended to remain the largest throughout the 5-year period, there was a negative correlation between nursery height and net height growth in the first year after outplanting. The best predictor of fifth-year height and basal diameter was the amount of lateral shoot growth; however, none of the correlations between fifth-year performance and first-year seedling growth traits suggested reliable prediction of future performance.

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    Rink, George; Van Sambeek, J. W. 1987. Seedling-sapling growth variation in a southern Illinios black walnut provenance/progeny test. In: Guries, R. P., ed. Proceedings of the Fifth North Central Tree Improvement Conference. Madison, WI: University of Wisconsin-Madison: 156-162


    Juglans nigra, narrow-sense heritability, variance, seed source, expected gains

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