Transcript of "Weed management for organic soybeans"
Organic weed management for soybeans Joel Gruver WIU Agriculture Jemail@example.com (309) 298 1215
Organic weed management Crop Adapted from Bailey and Lazarovits (2003)
Conservation Augmentation3 broad goals of Activation ecological management Suppression
A nice flush of weeds ready for terminationWhat can we do to maximize this flush? Not all tillage operations have the same effect
Terminating spring planted oats with a soil finisher ~ 3 weeks before planting corn GOAL = biological activation and suppression
Are you familiar with the fence post principle? Zone of maximum biological activity and rapid residue decay Deeper burial does not optimize decay but sends weed seeds into deep dormancy and brings deeply dormant weed seeds to the surface where they germinate slowly
Optimize crop establishment tomaximize crop competitiveness-Select a well adapted variety (maximum leafinessand rate of canopy closure)-Delay field work (soil must be warm enough forrapid crop emergence)-Prepare a good seed bed (start out clean)-Reduce row spacing and increase populations-Row fertilizer?
Preventive management• Flush soil seed bank with fallow periods• Walk crops• Employ alternative equipment for mowing, pulling weeds• Weedy crops -> forage or cover crops
ABCs of mechanical and cultural weed management Page 11 – Steel in the Field A. Give the crop the advantage. B. Keep weeds on the defensive. C. Accept weeds that don’t really matter.Excellent reference describingequipment for direct control of weeds
Blind cultivation Blind cultivation normally occurs before the crop emerges orshortly after emergence
Are you getting full performance out of your rotary hoe? 30’ rotary hoe
Rotary hoes and flex-tine weeders are most effective when the soil has a crustSome crop damage is inevitable but care should be taken to avoid times when crop is most fragile
Weed management for organic row crops I recently received a grant to support documenting the weed management practices used by top-notch organic weed managers How should we go about finding top- notch organic weed managers? What questions should we ask them?
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