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Survival and Growth of Douglas-Fir Seedlings with Spot-Spraying, Mulching and Root-Dipping

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Two vegetation management methods, paper mulching and spot-spraying with glyphosate, were combined with a root-dipping treatment, Terra SorbĀ®, to test effects on seedling survival and height growth on a harsh site in Oregon. Survival of Douglas-fir (Pseudotsuga menziesii) seedlings was significantly higher after the third growing season when competing vegetation had been controlled with mulch or glyphosate during the first two growing seasons. Seedlings retreated with paper mulch and glyphosate before the second growing season had 36 and 25% higher survival than those that were not retreated. None of the seedlings was retreated before the third season; after this season, survival of seedlings treated twice with glyphosate was 26, 23, and 21% higher than seedlings receiving one glyphosate treatment and one or two mulch applications, respectively. There were no differences in seedling height growth among treatments. Rootdipping with Terra SorbĀ® did not influence survival or growth. West. J. Appl. For. 1:108-111 Oct. 86.
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Document Type: Journal Article

Affiliations: Department of Forest Science, Oregon State University

Publication date: 01 October 1986

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