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Releasing Douglas-firs from Varnishleaf Ceanothus

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Well-stocked stands of young Douglas-firs are often found under dense overstories of varnishleaf ceanothus, but tree growth is retarded by shrub shade and competition for soil moisture. Aerial spraying effectively released Douglas-firs, and their growth was 1.7 to 2.5 times that of comparable trees under unsprayed ceanothus. A similar but less dramatic response was obtained by basal spraying varnishleaf ceanothus on small plots. A herbicidal treatment is suggested for releasing Douglas-firs from varnishleaf as soon as the trees are well established on such sites.
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Document Type: Journal Article

Affiliations: Forestry Plans Manager, Timberland Division, Weyerhaeuser Company, Tacoma, WA

Publication date: 1974-03-01

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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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    June 1, 2016 to Feb. 28, 2017

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