Herbicide Impacts on Soil Seed Bank in a Sugarbeet Rotation
2007
Sbatella, Gustavo M. | Miller, Stephen D. | David, Legg
The impact of different weed control treatments on soil seed bank dynamics was studied at Torrington, WY, for a corn/sugarbeet and barley/sugarbeet crop rotation. Common lambsquarters, hairy nightshade, and redroot pigweed accounted for 90% of the total weed seed in the soil seed bank. Samples collected after corn or barley harvest showed no significant differences in total seed numbers due to herbicide treatments; however, differences were evident in samples collected following sugarbeet harvest. Glyphosate applied postemergence at the 2 and 6 true-leaf sugarbeet stage or the conventional treatment of ethofumesate preplant plus two postemergence applications of triflusulfuron plus phenmedipham / desmedipham / ethofumesate plus clopyralid in sugarbeet reduced the total number of weed seed in soil following all corn treatments. The reduction in total seed bank numbers was due to the decrease in redroot pigweed and hairy nightshade seed density. An increase in total seed bank numbers was observed when the micro-rate treatment (three postemergence applications of triflusulfuron plus phenmedipham / desmedipham / ethofumesate plus clopyralid) in sugarbeet followed any barley treatment. No sugarbeet treatment reduced total seed numbers following untreated plots in either barley or corn.
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