2019
Controlling Weeds in Soybeans FY19
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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
$60,122
Institution Funded:
South Dakota State University
$60,122
Brief Project Summary:

Herbicide-resistant and difficult-to-control weeds cause yield loss and costs to soybean farmers. In this project, researchers 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 examine agronomic traits of Xtend soybeans at four eastern locations planted at 3 timings. The information gained will be presented to soybean farmers through outreach and education materials at applicator trainings, the Soy100 event, and field days.

Key Benefactors:
farmers, agronomists, extension specialists

Information And Results
Project Deliverables

1. Establish Herbicide Program Demonstration Plots
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. The primary objective of this portion of the project is to increase grower knowledge of herbicide resistance in soybean weed control programs (primarily common waterhemp and kochia) and help growers to fine-tune their weed management strategies. The strategies will include treatments of preemergence, pre-post combinations, post emergence, and new technology herbicide options such as Liberty, Xtend, 2,4-D and Balance.

2. Establish Glyphosate Resistance Management Demonstration plots
The glyphosate resistant plots will be utilized for grower and professional agronomist tours and training events. Data taken from the plots will include weed efficacy, crop injury ratings, and yield. Cost of treatment will also be calculated. Results will be printed in the annual SDSU Extension WEED Project Data book and will also be used in updating the weed control section of the SDSU Crop Protection Guide-Soybeans and IGrow Soybean Production manual. Pictures of the plots and plot data will be used at winter meetings around the state. Examples of meetings that data will be used at include Commercial Applicator Training, Private Applicator Training, Row Crop Clinics, IPM Consultant Training and Winter IPM Short Course.

3. Establish Xtend and Enlist soybean trials at Brookings, Beresford, and Watertown, Aberdeen
Xtend soybean trials will be established at four locations. (Enlist soybean varieties are not available for agronomic trials at this time) Planting will be done early, mid, and late timings on 30” rows in a randomized complete-block design with four replications. Herbicide applications will be applied at labelled rates and timings and at 2X rates. Agronomic traits (emergence, canopy closure, flowering, pod/plant, seed size, grain quality) will be evaluated. Weed control will be visually evaluated 2 weeks after application, 4 weeks after application, and prior to harvest. Weed biomass will be taken at the last observation.

Final Project Results

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.