2022
Controlling weeds in soybean
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Contributor/Checkoff:
South Dakota Soybean Research and Promotion Council
Category:
Sustainable Production
Keywords:
AgricultureCrop protectionHerbicide
Parent Project:
Controlling weeds in soybean
Lead Principal Investigator:
Sharon Clay, South Dakota State University
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
South Dakota Soybean Research and Promotion Council
$49,514
Institution Funded:
South Dakota State University
$49,514
Brief Project Summary:
Herbicide-resistant and difficult-to-control weeds cause yield loss and significant management costs to soybean farmers. In this project, we will establish demonstration plots to provide today’s best options for weed management; assess herbicide treatments on glyphosate-resistant waterhemp using combinations of herbicide chemistries; and establish simulated drift on non-dicamba soybeans and determine effects on yield. The information gained on the herbicide resistance and Xtend soybean project will continue to be presented to soybean farmers through outreach and education materials, information at applicator trainings, Soy100 conference, field days, and written materials.
Key Beneficiaries:
#agronomists, #extension specialists, #farmers
Unique Keywords:
#dicamba, #herbicides, #waterhemp, #weed control, #weeds
Information And Results
Project Summary

Herbicide resistant and difficult to control weeds cause yield loss and significant management costs to soybean farmers. We will: 1) establish demonstration plots to provide today’s best options for weed management; 2) assess herbicide treatments on glyphosate resistant waterhemp using combinations of herbicide chemistries and 3) Establish simulated drift on non dicamba soybeans and determine effects on yield.
The information gained on herbicide resistance, and Xtend soybean project has been, and will continued to be, presented through outreach and education materials to soybean farmers through information at applicator training, Soy 100, field days, and written materials.

Project Objectives

1. Establish demonstration plots in three areas of SD that highlight today’s best herbicide options and application timings for resistant weed control in soybean.
2. Assess alternative herbicide treatments on glyphosate resistant waterhemp with more modes of Action.
3. Establish simulated drift on non-dicamba soybeans and determine effects on yield.

Project Deliverables

Deliverable 1 - A series of herbicide program demonstration plots including herbicide (glyphosate) resistance options in soybeans will be established at three locations; Southeast SD Research Farm (Beresford), Northeast SD Research Farm (South Shore) and the SDSU Volga Research Farm.

Deliverable 2 - The second objective is to establish plots with different mixtures of glyphosate and glufosinate to make both the most effective as possible. In preliminary work it appears that there may be some antagonism if the two are sprayed together. The studies will look at different rates of mixtures and also different timing of the use of these products. The study will be done at two sites. One at the Volga research farm with heavy glyphosate resistant waterhemp and lambsquarter. The second at the NE research farm where there is heavy yellow foxtail along with pigweed, and ragweed.

Deliverable 3 - This study would be looking at application at the last labelled date for dicamba application (late June). This experiment would help to determine in South Dakota conditions if visual injury symptoms and yield are different at these later dates with the new dicamba products. Also, the treatments will have a PPO herbicide applied one week before, same time and one week after application which causes burn to soybean to determine if this will result in greater injury and yield loss. Injury ratings and pictures would be taken weekly until symptoms dissipate. The drift trial will be conducted at the Volga research farm where the plot can be watched closer during the growing season.

Progress Of Work

Updated February 3, 2022:
See attached report

View uploaded report Word file

Updated February 3, 2022:
See attached report

View uploaded report Word file

Final Project Results

Benefit To Soybean Farmers

The information gained on herbicide resistance, and Xtend soybean project has been, and will continued to be, presented through outreach and education materials to soybean farmers through information at applicator training, Soy 100, field days, and written materials.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.