Crop rotation and slurry application method improvement BMPs, which mainly targeted N loss and odor, had been implemented since 2004 and 2005, respectively. Since all sampling activities, described below, have taken place from June 2008 to December 2009 after the last BMP was implemented in early 2007 and since that there had yet been no measurable effect of these implemented BMPs on water quality when this study was undertaken, their impact on sediment P algal availability and release