Project Details:

Row Spacing and Residual Herbicide Use in Enlist and LLGT27 Soybeans

Parent Project: This is the first year of this project.
Checkoff Organization:Kansas Soybean Commission
Categories:Weed control, Agronomy, Economics
Organization Project Code:2101
Project Year:2021
Lead Principal Investigator:Sarah Lancaster (Kansas State University)
Co-Principal Investigators:
Kraig Roozeboom (Kansas State University)

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

This project will quantify the weed control and economic benefit of using a layered residual herbicide with narrow row spacing in two weed management systems. Trials will be conducted 3 locations in central and eastern Kansas.

Project Objectives

a. Compare weed control and soybean yield in 30- and 15-inch row spacing
b. Compare weed control and soybean yield with and without over-the-top residual herbicide
c. Evaluate the interaction of row spacing and overlapping residual herbicide use

Project Deliverables

Progress of Work

Updated September 7, 2021:
Trials were successfully established at all three locations. Preliminary results were shared with farmers at the Ottawa and Scandia field days. The project has been submitted for presentation at the North Central Weed Science Society annual meeting in December.

View uploaded report Word file

Final Project Results

Updated April 5, 2022:
Project results have been presented at field days in Ottawa and Scandia, KS. The graduate student managing the project is currently preparing his thesis and the manuscript for publication in a peer-reviewed journal.

Including Dual Magnum in the postemergence herbicide application did not result in a statistically significant increase in visual estimates of weed control at any location, even when there were differences in soybean populations. However, it is important to remember that a small difference in estimated control of weeds like waterhemp and Palmer amaranth can result in greater weed populations in future years. Furthermore, weed escapes increase the likelihood of herbicide resistance, especially in weeds with a lot of genetic diversity, like waterhemp and Palmer amaranth. Results of partial budget analyses varied with location, with few discernable trends.

Benefit to Soybean Farmers

Performance Metrics

Project Years