2022
Weed Management in Very Early-Planted Soybeans
Home
Contributor/Checkoff:
Illinois Soybean Association
Category:
Sustainable Production
Keywords:
Field management Nutrient managementSoil healthTillageYield trials
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Aaron Hager, University of Illinois at Urbana-Champaign
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
Illinois Soybean Association
$43,478
Institution Funded:
University of Illinois at Urbana-Champaign
$43,478
Brief Project Summary:

Interest has increased in planting soybean weeks earlier compared with long-term averages for the increased yield potential. This can be offset by environmental and pest-related factors that could reduce yields. Weed control is of paramount importance yet scant data exists to guide weed management recommendations in early-planted soybeans. This project includes field research at four locations established in early April to investigate pre-herbicide application rate and timing and post applications with and without a layered residual. Experiments include using soil-residual herbicides, foliar-applied herbicides and a close watch on waterhemp emergence and establishment on soybean yields.

Key Benefactors:
farmers, agronomists, applicators, extension specialists

Information And Results
Project Deliverables

Treatments will consist of three levels of soil-residual herbicide: 1) None, 2) ½ Rate applied at planting, and 3) Full rate applied at planting. Postemergence treatments will include: 1) Glyphosate + glufosinate, 2) Glyphosate + glufosinate + ½ rate of a layered PRE, and 3) Glyphosate + glufosinate + full rate of layered PRE. Application of postemergence treatments will occur when weeds reach four-inches, which could include three application timings (i.e., weeds likely to reach four inches sooner in No PRE plots compared with Full PRE plots). Data to be collected include:

Soil temperature at planting
Days until soybean emergence
Days until weeds reach four inches in height
Weed control efficacy
Weed density before application of POST treatments
Soybean yield

Final Project Results

Updated October 24, 2022:

View uploaded report Word file

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.