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Home → Publications → Tree Improvement and Genetics → Central States Forest Tree Improvement Conference → 9th Central States Forest Tree Improvement Conference (1974) → Black Walnut in Central Kentucky: Growth and Development of Half-Sib Families Under Artificial Shade

Black Walnut in Central Kentucky: Growth and Development of Half-Sib Families Under Artificial Shade

Net photosynthesis and growth and development of black walnut half-sib families from open and forested habitats were studied in the laboratory and the field under artificial shade. Maximum net photosynthesis occurred at a relatively low light intensity of 4,000 footcandles in comparison to intolerant conifers which reach maximum rates of photosynthesis at full sunlight. Photosynthesis was similar in seedlings from open and forested habitats. Germination, height growth, dry matter production, leaf surface areas and nitrogen, potassium, and phosphorous contents of seedlings grown under light and medium shade levels were greater than that achieved in the open and under heavy shade. Photosynthetic adaption to contrasting light climates has not occurred in central Kentucky.


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Author(s): Stanley B. Carpenter

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