Project Details:

Control of Pigweed with an Integrated Systems Approach in Soybean

Parent Project: Control of Pigweed with an Integrated Systems Approach in Soybean.
Checkoff Organization:Kansas Soybean Commission
Categories:Weed control, Crop management systems, Sustainability
Organization Project Code:1880
Project Year:2018
Lead Principal Investigator:Anita Dille (Kansas State University)
Co-Principal Investigators:

Contributing Organizations

Funding Institutions

Information and Results

Comprehensive project details are posted online for three-years only, and final reports indefinitely. For more information on this project please contact this state soybean organization.

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Final Project Results

Updated April 15, 2019:
All field trials have been completed. See attached report for details. One Extension publication is near final publication and is attached (MF3448 Pigweed).

View uploaded report Word file

View uploaded report 2 PDF file

All treatments containing the herbicide program component resulted in excellent (> 97%) pigweed control which demonstrates the importance of using overlapping residual herbicides with multiple effective sites of action. Treatments containing row-crop cultivation (RC) tended to reduce pigweed density and biomass at 3 and 8 weeks after planting (WAP) in all locations compared to the 30-inch row width no cover crop treatment. Mixed results were observed when the effect of winter wheat cover crop (CC) was considered: in about half of the site-years, CC provided approximately 50% reductions in pigweed density and biomass whereas in the remainder CC provided no change to an increase in pigweed density. Decreased row widths achieved the most consistent results by reducing pigweed biomass at 8 WAP when data were pooled across location: decreasing row widths from 30-inches to 15-inches resulted in a 23% reduction whereas decreasing from 15-inches to 7.5-inches achieved a 15% reduction. In conclusion, RC should be incorporated where possible as a mechanical option to manage pigweed, and decreased row widths should be used when economically feasible to suppress late season pigweed growth. CC achieved inconsistent pigweed control in this research and should be given special consideration prior to implementation. The integral use of these components with an herbicide program as a system should be recommended to achieve the best pigweed control as well as reduce the risk of resistance.

Project Years