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To establish a stand of desirable trees successfully, vegetation management is usually needed as part of site preparation or during the first few years after regeneration, especially when the vegetation competition is very intense. In 1988, an operational trial was established in a one-year-old white spruce (Picea glauca) plantation in the SBSdw3 biogeoclimatic zone to examine the effectiveness of glyphosate herbicide on a vegetation community. The study consists of two 1 ha treatment plots, one of which was treated with aerially applied glyphosate at a rate of 2.14 kg a.i./ha. Ten years after treatment, glyphosate had significantly increased height, basal diameter and crown radius, and reduced height-to-basal diameter ratio. The herbicide treatment did not result in more free-growing spruce trees per hectare 11 years after planting because aspen patch was present in portion of the treated plot and further assessment may be needed as the trees are still in free growing window. Glyphosate had no significant affect on plant species diversity.
Biring, B.S., Yearsley, H.K.; Hays-Byl, W.J.. 2001. Ten-year Responses of White Spruce and Associated Vegetation after Glyphosate Treatment at Tsilcoh River. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Extension Note (FLNRORD). EN55
Topic: FLNRORD Research Program
Keywords: Vegetation, Management
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