2014
The Micro-Rate System: Addressing Current Issues in Weed Management
Contributor/Checkoff:
Category:
Sustainable Production
Keywords:
AgricultureCrop protectionHerbicide
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Richard K Zollinger, North Dakota State University
Co-Principal Investigators:
Angela Kazmierczak, North Dakota State University
Devin Wirth, North Dakota State University
+1 More
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

Roundup kills most all grass and broadleaf weeds sprayed. Roundup Ready soybeans were developed with resistance to the herbicide Roundup (glyphosate). Roundup is relatively inexpensive, controls a wide spectrum of weeds, and has excellent crop safety provides economical weed control in Roundup Ready soybean. However, excessive use of Roundup as the only herbicide used in Roundup Ready crops has not only created tolerant and resistant weeds, but also requires use of other modes of action with or without glyphosate.

The NDSU micro-rate herbicide program was developed several years ago before Roundup Ready and Liberty Link crops were registered. This micro-rate system uses reduced rates...

Unique Keywords:
#micro-rates, #post-emergence weed control, #weed control
Information And Results
Project Deliverables

Final Project Results

Current weed management recommendations emphasize spraying small weeds. One liability of spraying weeds one to two inches tall is the possibility of weeds germinating after application. This may cause growers to delay their applications until weeds are larger, but risk of reduced herbicide activity because weeds are beyond the recommended growth stage for greatest herbicide activity. This occurred with herbicide micro-rate treatments applied at 3- to 4-inch and 5- to 6-inch weed heights.

These studies show that a herbicide micro-rate system containing five different herbicide active ingredients/modes of action, applied at reduced rates, but with a superior adjuvant applied through sequential applications 14 days apart, gives excellent early and season-long control. The sequential application easily controls a broad spectrum of weeds early in the season and clean fields are then supported through quick soybean canopy closure and provide excellent season-long weed control. The data also shows that tank-mixing multiple herbicide mechanisms of action is beneficial to delay weed resistance.

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.