Growth Differences Among Patented Grafts, Seed Orchard Seedlings, and Nursery-Run Seedlings of Black Walnut
A major consideration in short-rotation management of black walnut (Juglans nigra L.) is the planting of genetically improved stock. Two sources of improved planting stock were compared with nursery-run (i.e., average seedlings obtained from the nursery) seedlings to evaluate differences in diameter, height, and stem form quality. Purdue #1 patented grafts, seedlings developed from direct-seeded nuts (TVA seed orchard), and nursery-run seedlings were compared after 4 years of intensive management. No significant differences were found between patented grafts and the seed orchard material, but both outperformed nursery-run material by 20 to 30% growth increases. Tree Planters' Notes 40(3):29-32; 1989.
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Author(s): William E. Hammitt
Publication: Tree Planters' Notes - Volumes 40, Number 3 (1989)
Section: General
Volume: 40
Number: 3
