1. Benefits of Gypsum for Soil and Water Mangement L. Darrell Norton, Soil Scientist USDA-ARS National Soil Erosion Research Laboratory Purdue University, West Lafayette, IN

2. The Problem: Water/Air Entry

6. DeWitt, Iowa Site Fayette silty clay loam 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 51015202530354045505560 Duration [min] 0.00 20.00 40.00 60.00 80.00 mm/h soil loss [g/m^2*s]

7. Fayette PAM+FBCBA Treatment 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 51015202530354045505560 Duration [min] 0.00 20.00 40.00 60.00 80.00 mm/h soil loss [g/m^2*s]

8. Catlin Gypsum + PAM

11. TIME = 0 minTIME = 1 hour

26. Nitrogen Applied T/sq. mile Introduction: surface acidity