Paper No. JAWRA-08-0027-P of the Journal of the American Water Resources Association (JAWRA). Discussions are open until October 1, 2009.
Development of a Quantitative Pasture Phosphorus Management Tool Using the SWAT Model1
Article first published online: 4 MAR 2009
© 2009 American Water Resources Association
JAWRA Journal of the American Water Resources Association
Volume 45, Issue 2, pages 397–406, April 2009
How to Cite
White, M. J., Storm, D. E., Smolen, M. D. and Zhang, H. (2009), Development of a Quantitative Pasture Phosphorus Management Tool Using the SWAT Model. JAWRA Journal of the American Water Resources Association, 45: 397–406. doi: 10.1111/j.1752-1688.2008.00295.x
- Issue published online: 25 MAR 2009
- Article first published online: 4 MAR 2009
- Received January 31, 2008; accepted August 22, 2008.
- watershed management;
- nonpoint source pollution;
- phosphorus management;
- phosphorus index;
- field scale
Abstract: Assessment tools to evaluate phosphorus loss from agricultural lands allow conservation planners to evaluate the impact of management decisions on water quality. Available tools to predict phosphorus loss from agricultural fields are either: (1) qualitative indices with limited applicability to address offsite water quality standards, or (2) models which are prohibitively complex for application by most conservation planners. The purpose of this research was to develop a simple interface for a comprehensive hydrologic/water quality model to allow its usage by farmers and conservation planners. The Pasture Phosphorus Management (PPM) Calculator was developed to predict average annual phosphorus (P) losses from pastures under a variety of field conditions and management options. PPM Calculator is a vastly simplified interface for the Soil and Water Assessment Tool (SWAT) model that requires no knowledge of SWAT by the user. PPM Calculator was validated using 33 months of data on four pasture fields in northwestern Arkansas. This tool has been extensively applied in the Lake Eucha/Spavinaw Basin in northeastern Oklahoma and northwestern Arkansas. PPM Calculator allows conservation planners to take advantage of the predictive capacity of a comprehensive hydrologic water quality model typically reserved for use by hydrologists and engineers. This research demonstrates the applicability of existing water quality models in the development of user friendly P management tools.