2005 Annual Report 4d.Progress report. This report serves to document research conducted under a reimbursable agreement between ARS, University of Georgia, and the USDA National Research Initiative Competitive Grant Program within Soils and Soil Biology. Additional details can be found in the report for the parent CRIS 6612-12000-011-00D "Enhancing Soil-Water-Nutrient Processes in Southern Piedmont Pasture Systems". This project is being implemented in the laboratory and at multiple scales in the field to partially fulfill two CRIS objectives: to improve and increase management options for land applied manures to grasslands and to develop strategies which limit phosphorus (P) loss from soils in the southeastern USA. The multiple scale studies below will better define phosphorus speciation for applied animal manures (broiler litter, layer manure, and dairy slurry) as manures are washed into the soil and across grasslands using different management strategies. Rainfall simulations have been conducted on two sets of thirty small intact cores (0.18 m2 ) : one set being of kaolinitic mineralogy the other being of smectitic mineralogy and on 48 small plots (1.5 m2) with four aeration or mechanical treatments (no-till, core, spike, and none). Base line information for runoff quality and quantity is being collected on eight grazed paddocks (0.8 ha) and treatments will be imposed in late spring depending on results from simulation studies. This project is moving forward in accord with the timeline submitted to and approved by funding agency.