The EPA now requires new dicamba formulations registered for dicamba-resistant crops to have a pH of 5.0 or higher because of volatility and off-target damage concerns. When it comes to applying spray mixtures under field conditions, though, how do you ensure that pH remains sufficiently high?
In an article written for the journalWeed Technology, researchers summarize studies to determine the pH effect of various commercial products used in dicamba-based spray mixtures -- including dicamba formulations, glyphosate, drift retardant, ammonium sulfate and several pH modifiers. In each instance, the products were added to water with an initial pH of 4.6 to 8.4.
"Though no direct efficacy or volatility measurements are made in our report, it is clear that having an accurate understanding of what is happening to spray mixture pH is foundational to the sustainable and environmentally responsible use of dicamba products," says Tom Mueller, Ph.D., lead author of the paper and a professor at the University of Tennessee.
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