Testing the Wisconsin Phosphorus Index with Year-Round, Field-Scale Runoff Monitoring

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dc.contributor.authorGood, Laura W.
dc.contributor.authorVadas, Peter
dc.contributor.authorPanuska, John C.
dc.contributor.authorBonilla, Carlos A.
dc.contributor.authorJokela, William E.
dc.date.accessioned2025-01-24T00:06:41Z
dc.date.available2025-01-24T00:06:41Z
dc.date.issued2012
dc.description.abstractThe Wisconsin Phosphorus Index (WPI) is one of several P indices in the United States that use equations to describe actual P loss. processes. Although for nutrient management planning the WPI is reported as a dimensionless whole number, it is calculated as average, annual dissolved P (DP) and particulate P (PP) mass delivered per unit area. The WPI calculations use soil P concentration, applied manure and fertilizer P, and estimates of average annual erosion and average annual runoff. We compared WPI estimated P losses to annual P loads measured in surface runoff from 86 field-years on crop fields and pastures. As the erosion and runoff generated by the weather in the monitoring years varied substantially from the average annual estimates used in the WPI, the WPI and measured loads were not well correlated. However, when measured runoff and erosion were used in the WPI field loss calculations, the WPI accurately estimated annual total P loads with a Nash-Sutcliffe Model Efficiency (NSE) of 0.87. The DP loss estimates were not as close to measured values (NSE = 0.40) as the PP loss estimates (NSE = 0.89). Some errors in estimating DP losses may be unavoidable due to uncertainties in estimating on-farm manure P application rates. The WPI is sensitive to field management that affects its erosion and runoff estimates. Provided that the WPI methods for estimating average annual erosion and runoff are accurately reflecting the effects of management, the WPI is an accurate field-level assessment tool for managing runoff P losses.
dc.fuente.origenWOS
dc.identifier.doi10.2134/jeq2012.0001
dc.identifier.issn0047-2425
dc.identifier.urihttps://doi.org/10.2134/jeq2012.0001
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101870
dc.identifier.wosidWOS:000311262400004
dc.issue.numero6
dc.language.isoen
dc.pagina.final1740
dc.pagina.inicio1730
dc.revistaJournal of environmental quality
dc.rightsacceso restringido
dc.subject.ods02 Zero Hunger
dc.subject.odspa02 Hambre cero
dc.titleTesting the Wisconsin Phosphorus Index with Year-Round, Field-Scale Runoff Monitoring
dc.typeartículo
dc.volumen41
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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