Mackay River Herbicide Trial: Conifer Response 9 Years Post-treatment
Ministry of Forests, Research Program, Jan 1, 1997 - Forest site quality - 26 pages
Describes a 1986 field trial in which investigators applied four different treatments (glyphosate, 2,4-D amine, 2,4-D ester, and manual brushing) in an incomplete block design to a four-year-old fireweed/shrub community in the Mackay River drainage, south-west British Columbia. The purpose of the trial was to evaluate the effectiveness of the treatments in releasing hybrid spruce seedlings. Competing vegetation species, their height, and percent cover were determined in 1986-87 and 1995. The trial was re-measured in 1995 to determine whether there were any long-lasting effects of treatment on growth and condition of planted spruce seedlings. Statistical analyses were used to determine differences in spruce seedling root collar diameter, crown diameter, height, and height growth increments.
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0,4-D Ester Glyphosate 1995 spruce seedling 2,4-D amine treatment 2,4-D ester treatments Amine 2,4-D Ester amine treat anova Appendix black twinberry block design ibd conifer Control 2,4-D Amine Cover Height Cover crown diameter cutblock diam difference at p<0.05 different letters signify elderberry ester and manual Ester Glyphosate Manual fireweed glyphosate treatment glyphosate-treated spruce Height cm Height Cover cm Height Cover Height height growth height increment herbicide Hieracium albiflorum ibd anova incomplete block design increment Ht letters signify statistical Lonicera involucrata Mackay River manual brushing manual treatments ment Ministry of Forests Newsome percent cover planned contrasts planted spruce remeasurement Ribes viscosissimum root collar diameter Rubus parviflorus Rubus pedatus Sambucus racemosa seedling damage significantly taller signify statistical difference silviculture survey data Sitka alder spruce seedling height stems per hectare stocking Subalpine fir subplots Systat Table target species Thuja plicata total vegetation cover Tr 0 Tr vegetation management Western redcedar