MIX MATTERS. The soybean plot on the left was sprayed with a mix of 32 ounces of Liberty, 12.5 ounces of Cobra and 1 pint of Flexstar using an AIXR110015 nozzle. The plot on the right received an application of 1 pint of Flexstar only using a TTI110015 nozzle. “When we switch to an AIXR nozzle, we see improvement across the board,” Arsenijevic says. Photo: Nikola Arsenijevic

Adding Glufosinate to Tank Mixes Improves Overall Weed Control in Soybeans

Research trial finds using appropriate nozzles compounds effectiveness of Liberty tank mixes

The future of weed control is tank mixes, according to researchers at the University of Wisconsin-Madison, and herbicide efficacy is greatly affected by what exactly is in the mix and how it's applied

Nikola Arsenijevic, a graduate student at Rodrigo Werle’s University of Wisconsin-Madison weed research lab, is evaluating the impact of different tank mixes and nozzle selections on control of waterhemp, giant ragweed and annual grasses in soybeans.

“From a resistance-management standpoint, it’s always better to have more than one effective chemical in a tank, which will help mitigate herbicide resistance evolution,” Arsenijevic says.

Tank-Mix Weed Control

In July, Arsenijevic collected his first year of data from two sites in southern Wisconsin. The collection evaluated weed control by species and overall control 28 days after making post-emergence applications of several glufosinate and PPO-inhibitor tank mixes at 15 gallons per acre (see sidebar). 5 ounces of Sonic (sulfentrazone and cloransulam-methyl) was also applied to all plots as a pre-emergence herbicide after planting.


KEEPING CLEAN. This graph shows how well various herbicides and tank mixes controlled all present weed species within two plots in southern Wisconsin. Each herbicide or mix was applied with 3 different nozzles to assess how droplet size impacted weed control. The dashed line represents 90% weed control, which researcher Nikola Arsenijevic considered satisfactory weed control. Arsenijevic says Liberty makes a “night and day difference” in how clean the plot is due to its ability to control grasses. Credit: Nikola Arsenijevic

Click to enlarge

The addition of Liberty…

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Michaela paukner

Michaela Paukner

Michaela Paukner is the managing editor of No-Till Farmer, Strip-Till Farmer and Cover Crop Strategies. Her previous journalism experience includes working as a reporter for a legal magazine and as a producer for two Wisconsin TV news stations. She has also worked with clients across the globe as a freelance writer and marketing consultant, and as a brand manager for a Wisconsin-based boutique marketing agency. She's a graduate of the University of Wisconsin-Green Bay.

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