A two-year study conducted by L. Darrell Norton of the National Soil Erosion Research Laboratory demonstrated successful results in reducing runoff volumes in agricultural applications. Addition of Gypsum to the soil not only improved infiltration, but had the added benefit of reducing concentrations of Sodium Reactive Phosphorous (found in fertilizers) and Atrazine (found in herbicides). The study concluded that use of the gypsum amendment during application of fertilizer and herbicide treatments is a practical management approach in making agriculture more sustainable with respect to surface water quality. The findings, presented at the 9th Biennial Conference on Stormwater Research and Watershed Management, can be read here.