Investigation of the Influence of Low Drift Nozzles and Weed Density on Herbicide Deposition and Efficacy Year 1
Sustainable Production
AgricultureCrop protectionHerbicide
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Travis Legleiter, University of Kentucky
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

The introduction of Roundup 2 Xtend soybean (resistant to dicamba and glyphosate) and the registered formulations of dicamba (Xtendimax, Engenia, and FeXapan) placed a new tool in the hands of farmers to control troublesome broadleaf weeds. Although the introduction of these technologies did not come without issues as millions of acres of sensitive soybean were injured from offsite movement of dicamba from Xtend fields. Tight restrictions have been placed on the dicamba labels in an effort to mitigate the movement of dicamba, including restrictions of applications with specific nozzles that produce extremely coarse and ultra coarse droplets. Applications with droplets in the ultra coarse...

Unique Keywords:
#weed control
Information And Results
Project Deliverables

This research can help improve our knowledge and understanding on how to make dicamba applications with the required nozzles to reduce drift potential while maximizing deposition onto Palmer amaranth, waterhemp, and grass species. By having this information, we will be able emphasize the situations, such as high weed densities, in which failures of herbicide applications are more likely to occur with the required low drift nozzles. Information will be extended to soybean producers, crop consultants, extension agents, agricultural retailers, and industry representatives through various mechanisms including newsletters, meetings and field days.

Final Project Results

*1. State of the Project Objective(s):

The objective was to determine the influence of nozzle design, droplet size, and weed density on the disposition and efficacy of glyphosate plus dicamba. The primary target species were goosegrass, Palmer amaranth, and waterhemp. Evaluations of goosegrass and Palmer amaranth have been completed.

*ii. Statement of quantifiable progress toward project objective(s) achieved during this reporting period.

Field trials and greenhouse trials evaluating goosegrass and Palmer amaranth density and nozzle design were conducted and completed in the summer and Fall of 2018. Data analysis completed for experiments.

Results have been presented at county, state, national, and international conferences.

*iii. Activities planned between now and the next reporting period.

All research activities completed and final reports are being finalized for submission.

iv. Problems and/or obstacles that may impact the completion date, cost or scope of the project.

Waterhemp and Palmer populations at non-UK sites were not sufficient to conduct a proper density experiment. A complementary Palmer amaranth density trial was conducted in the greenhouse.

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.