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The Effect of Chilling and Photoperiod on Bud Break in American Elm

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Seedlings of American elm (Ulmus americana, L.) were subjected to chilling temperatures for periods ranging from 15 through 60 days and to photoperiods ranging from 6 through 19 hours. Results show moderate chilling treatment and an extended photoperiod are most effective in giving maximum hud break in the shortest length of time. Data also indicate temperature may be a significant factor in determining bud break, especially if photoperiod is limiting.
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Document Type: Journal Article

Affiliations: Staff of the Agric. Research Service, Crops Research Division, Shade Tree and Ornamental Plants Laboratory, U.S. Dept. Agric., Delaware, Ohio

Publication date: 1965-03-01

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

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