Growth of Multipot Black Spruce Seedlings Planted After Site Preparation with Liquid and Dry-Flowable Hexazinone
Authors: Reynolds, Phillip E.; Roden, Michael J.
Source: Northern Journal of Applied Forestry, Volume 12, Number 2, 1 June 1995 , pp. 75-79(5)
Publisher: Society of American Foresters
Abstract:Liquid (VELPAR L) and dry-flowable (VELPAR ULW) hexazinone (2 kg ai/ha) were aerially applied to a northern New Brunswick clearcut to reduce raspberry competition. Treatments were applied in June 1987; planting with containerized (multipot) black spruce was conducted 2 and 14 months after treatment in August 1987 and August 1988, respectively. Seedling survival and growth were measured yearly through August 1991. Five growing seasons after treatment, raspberry competition was generally less in treated plots than in controls. Hexazinone formulation did not affect raspberry control, seedling survival, or growth. Seedlings planted 14 months after hexazinone treatment grew poorly compared with those planted 2 months after herbicide treatment. Both height and stem diameter of seedlings planted 2 months after hexazinone treatment remained greater than that of control seedlings through 1991. Diameter of treated seedlings exceeded that of control seedlings in the first growing season after planting; height of treated seedlings exceeded control seedlings 3 growing seasons after planting. Fourth-year stem diameter of seedlings planted 2 months after hexazinone treatment was correlated with raspberry cover (r² = 0.383) and with raspberry height (r² = 0.379). As raspberry competition increased, black spruce growth decreased. North. J. Appl. For. 12(2):75-79.
Document Type: Journal Article
Affiliations: Forest Pest Management Institute, Natural Resources Canada, 1219 Queen St. East, Sault Ste. Marie, Ontario P6A 5M7, Canada
Publication date: 1995-06-01
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