393-7 Surplus Phosphorus and Manure In Major Animal Production Regions of Maryland, Pennsylvania, and Virginia: Comparison of Methods and Implications.



Wednesday, October 19, 2011: 2:50 PM
Henry Gonzalez Convention Center, Room 212A, Concourse Level

Ronald Korcak1, Thomas Simpson1 and Caitlin Kovzlove2, (1)Water Stewardship, Inc, Annapolis, MD
(2)US EPA, Washington, DC
There is a need to compare the various methods used to characterize soil phosphorous (P) under conditions of high P loadings. Specifically, soil test P (STP), P Site Index (PSI) and P-Saturation percentage (P-Sat) were evaluated and compared in regards to the potential to meeting agronomic needs, and reducing soil P moving into water bodies. The implications of each method on surplus P in animal production regions were examined. Excessive P loadings were evaluated using two different nutrient balance approaches. The issue of surplus manure and manure-P and how to minimize the potential consequences of surplus P on the farmer are discussed. Aggregate data from 33 animal operations in the Shenandoah Valley Virginia will be presented to show the extent of the high soil P issue.
See more from this Division: S11 Soils & Environmental Quality
See more from this Session: Phosphorus Fate In Long-Term Fertilized/Manured Soils