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Mixing Issues with Enlist One and Glyphosate (07/11/19)

I have received a few questions about compatibility issues with Enlist One and some formulations of glyphosate for use in Enlist Soybean.

I have received a few questions about compatibility issues with Enlist One and some formulations of glyphosate for use in Enlist Soybean. Specifically, the questions have concerned the potassium salts of glyphosate. When some potassium salts of glyphosate are mixed with Enlist One in inductor tanks, then the products quickly separate, and a white chalky residue is left behind. In order to evaluate this ourselves, we did a simple jar test to mix 1 pint of Enlist One with 1 pint of a potassium salt of glyphosate (Roundup Powermax) or 1 pint of a dimethylamine salt of glyphosate (Durango DMA) at 3 different carrier volumes: 1, 3, and 15 gallons per acre. We then shook the bottles, and let them sit for 1 hour. Images 1-3 show the different mixtures at 1 minute after mixing, and image 4 shows all the mixtures 1 hour after mixing.

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At the lower carrier volumes, Enlist One + Roundup Powermax left white chalky residue on the container walls, and separated quickly. However, the mixture in 15 gallons per acre carrier volume stayed in solution and did not leave the residue behind. I should also note that we added most of the water to the 15 GPA bottles prior to adding the herbicides. The extra water in those bottles helped the products go into and stay in solution. Roundup Powermax and Durango DMA were the only two glyphosate formulations we tested, and we did not test any isopropylamine salts of glyphosate. I recommend a quick jar test if anyone wants to mix other glyphosate formulations with Enlist One in an inductor tank to test for these compatibility issues.

 

Joe Ikley

Extension Weed Specialist

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