Pre-Seed Weed Control
A pre-seed burn-off can help control invasive winter- and spring-annual weeds. It helps set up your crop for high yields due to less competition from weeds for soil nutrients and moisture.
Direct-seeded fields may contain a large number of weed seeds in the soil. If there is a warm spring and moisture conditions are adequate, early-, mid- and late-emerging weeds may germinate over a short period of time. In a cool spring, germination is spread over a longer period.
University of Saskatchewan research - Spray early:
Many growers spray as close to seeding as possible. They want the maximum number of weed seedlings emerged. But if seeding is delayed, University of Saskatchewan research shows that spraying earlier will conserve soil moisture and nutrients for the crop later in the season, thereby increasing crop yield.
Use a glyphosate add-in with residual when spraying pre-seed:
Use an add-in product to increase effectiveness on weeds that glyphosate does not adequately control, like glyphosate tolerant canola or narrow-leaved hawk’s-beard.
If you plan to seed cereals and want some residual control to carry you through to seeding, please note that the degree and duration of control depends on infestation levels and environmental conditions at and following application.
Best practices for pre-seed weed control:
- Scout fields frequently in early spring to determine the best timing for herbicide application
- Apply herbicides when weeds are young and actively growing
- Avoid spray drift into adjacent crops or other sensitive areas
- Use an add-in product with a view to increasing glyphosate effectiveness and/or providing residual control
- Note and follow any re-cropping restrictions with herbicides
- Use multiple groups of herbicides to reduce the risk of resistance
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