[American Society of Agricultural and Biological Engineers 21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, May 27-June 1, 2012, Bari, Italy - ()] 21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, May 27-June 1, 2012, Bari, Italy - Managing Phosphorus Enrichment in Watersheds with high levels of Livestock and Poultry Production