Andrew Sharpley, Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR, Douglas Beegle, Crop and Soil Sciences, The Pennsylvania State University, University Park, PA, Carl Bolster, Animal Waste Management Research Unit, USDA-ARS, Bowling Green, KY, Laura Good, UW Madison, Madison, WI, Brad Joern, Agronomy, Purdue University, W. Lafayette, IN, Quirine Ketterings, Dept. of Animal Science, Cornell University, Ithaca, NY, John Lory, University of Missouri, Columbia, MO, Robert Mikkelsen, International Plant Nutrition Institute, Merced, CA, Deanna Osmond, Dept. of Soil Science/North Carolina State University, Raleigh, NC and Peter Vadas, USDA-ARS, Madison, WI