Performance of Select Walnut in Indiana After 10 Years
Ten-year growth and stem quality of seedlings were compared among seven black walnut (Juglans nigra) populations and one half-sibling (“half-sib”) family. Seed was collected and sown in the fall of 2001 in the Indiana Division of Forestry (IN DoF) Vallonia Nursery, and 1-0 seedlings were out-planted at two central Indiana sites in 2003. A companion planting of half-sib seedlings from a single phenotypic plus-tree selection was planted adjacent to each test planting by direct seeding in May 2003. Growth varied significantly between sites but was not statistically significant among populations at either site after ten years. Population, however, had a highly significant effect on timber-form quality. Significantly better stem quality was observed for the two select seed sources and the companion half-sib family. Average performance of the two select orchard populations was 13 percent above the plantation mean based on a compilation of all measured criteria.
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Author(s): James R. McKenna, Philip A. O’Connor
Publication: National Nursery Proceedings - 2013
Event:
Joint meeting of the Northeast Forest and Conservation Nursery Association and Southern Forest Nursery Association
2013 - Lafayette, Indiana
