Properly mixing herbicides in the tank

The order in which a herbicide and other ingredients are added into a spray tank can have a serious effect on the performance of the herbicide application. The right mixing sequence ensures incompatible products won’t gel or form precipitates that can clog spray equipment or antagonize one another resulting in decreased weed control.

Jim Reiss is the vice president for product development for Precision Laboratories. He says it’s tough because most product labels don’t have clear mixing instructions.

"Many products assume they’re the only thing going in the tank so they don’t really address the tank mix partners and formulations. Quite truthfully, it’s really hard to figure out what specific formulation many products are. A lot of labels just don’t tell you that they’re an EC or a suspension concentrate, or an emulsion. The old WALE mixing sequence doesn’t really apply," says Reiss. "It’s hard to get it to apply because we have so many more different types of formulations."

He says they have a “mix tank app” that can help take the guesswork out of mixing herbicides.

"You can download it from the app store, it’s free, and you can actually build recipes and load sheets. But really, one of the best things that the app does, is it sorts out the proper mixing sequence based on the formulation type," he says. "We’ve worked with manufacturers to actually identify the right formulation types for their products even though they don’t necessarily tell you on their label."

Do a jar test to make sure the products are physically compatible. Test for chemical incompatibility by spraying the mixture in a small area and checking for crop damage or reduced performance.

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