Quite simply, agricultural spray adjuvants are chemicals added to a herbicide to improve its effectiveness. This is done by improving retention, deposition and/or absorption of the chemical.
In the United States, adjuvants are largely unregulated. In Canada, adjuvants are regulated by the Pest Management Regulatory Agency (PMRA). This means that adjuvants must be proven to be safe and effective in order to be sold with a certain active ingredient.
In many cases, adjuvants are used to increase the effectiveness of a herbicide mixed with hard water. But how do you know if your water is hard? And which adjuvant is typically the best to use in that case?
In this video, Rich Zollinger, professor and weed specialist at North Dakota State University talks about the basic attributes of an adjuvant, water hardness and how pre-packaging adjuvants may be stifling farmers’ creativity.