A key tool that producers can use to reduce the risk of developing herbicide resistant weeds is to use full rates of herbicides. Reducing the application rate of herbicides can help select for and speed up the development of resistant weeds in the plant population.
Minerals in the water used to spray herbicides can reduce the effectiveness of glyphosate and, in effect, reduce the application rate. Many producers use AMS to combat this process. The following article, originally published in No-Till Farmer magazine, does a very good job of explaining the need to determine the correct AMS use rate with glyphosate products.
Our Spray Water Test packages provide a suggested minimum AMS use rate by entering the lab results into an equation developed by researchers at North Dakota State University. However, herbicide users must always read and follow the herbicide label.