Not All Glyphosates Play Nice
Jun 03, 2021
It’s important to beware of potential compatibility issues with Enlist One Herbicide and Potassium-Salt or “K-salt” Glyphosates if not mixed correctly.
Not all glyphosates are made the same. You have Durango DMA, which is a DMA-salt, Abundant Edge, which is an IPA-salt, and Roundup PowerMAX, which is a K-salt. And for Enlist tank mixes, the different types of glyphosates make a big difference. Most importantly, the K-salt or potassium-salt glyphosate forms. There is a physical incompatibility with Enlist One herbicides and K-salt glyphosates.
If a K-salt glyphosate (Roundup PowerMAX) and Enlist One come in contact with one another, by either adding them to a tank mix one after the other with no time for recirculation or having them touch each other in a single cone with no water added at all, a heavy white residue develops when individual crystals form, otherwise known as salting-out issues.
The heavy white residue creates sludge that will plug spray tank screens and nozzles. Once this salting-out has happened, no amount of mixing water or other products would get it back into solution. A similar problem happens when AMS is added to the tank mix immediately before adding Enlist One.
The good news? The solution to these K-salt and AMS compatibility issues with Enlist One is simple. It is a bit more time consuming, but simple. You need to add these tank mix partners one at a time – pausing between each one to allow recirculation to happen before adding the next product. For dry tank mix partners, dry AMS, give it 5 minutes to recirculate. For liquid tank mix partners, K-salt glyphosates, give it 2 minutes.
Below are pictures of jar tests done by the University of North Dakota State Extension Weed Specialists to show compatibility issues between K-salt glyphosate and Enlist One. They mixed 1 pint of Enlist One with 1 pint of a K-salt of glyphosate (Roundup PowerMAX) or 1 pint of a DMA-salt of glyphosate (Durango DMA) at 3 different carrier volumes: 1, 3, and 15 gallons per acre. They then shook the bottles and let them sit for 1 hour. Images 1-3 show the different mixtures at 1 minute after mixing.
For more information, click here to view to the Enlist tank mix procedure:
As always, be sure to reach out to your Full Circle Ag Trusted Advisor for more information.
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