Sensitivity analysis of the Virginia phosphorus index management tool

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dc.contributorVirginia Techen
dc.contributor.authorJesiek, Julie B.en
dc.contributor.authorWolfe, Mary Leighen
dc.contributor.departmentBiological Systems Engineeringen
dc.coverage.countryUnited Statesen
dc.coverage.stateVirginiaen
dc.date.accessed2014-05-29en
dc.date.accessioned2014-05-30T13:13:49Zen
dc.date.available2014-05-30T13:13:49Zen
dc.date.issued2005en
dc.description.abstractThe phosphorus index (P-Index) is a risk assessment and management tool to aid in reducing the risk to water quality due to movement of excess phosphorus (P) from fields. An allowable P application rate is specified based on the computed risk. This study focused on the Virginia P-Index. The objectives were to determine the factors to which the P-Index is most sensitive and to determine the factors to which the resulting P application rate recommendations are most sensitive. A differential analysis was used to calculate relative sensitivity for nine baseline scenarios: a low, medium, and high baseline within three different regions of Virginia. Impact of user variability in estimating factor values was evaluated using a probability distribution analysis. The P-Index was most sensitive in the low and medium baseline scenarios to P management factors, including annual application rate, method of fertilizer application, and source availability factor In high-risk baseline scenarios, the P-Index was most sensitive to transport factors (erosion, runoff, or leaching). User variability had a greater impact on the P-Index and on P application rate recommendations as P risk increased over each of the three regions. The closer afield's P-Index value is to a threshold between P recommendation rate categories, the higher the probability that alternate P application rates will be recommended due to user variability The results highlight the need for consistent estimation of factor values, particularly the factors to which the P-Index is most sensitive and particularly in the higher-risk situations.en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationJesiek, J. B.Wolfe, M. L., "Sensitivity analysis of the Virginia phosphorus index management tool," Transactions of the ASAE. Vol. 48(5): 1773-1781. (doi: 10.13031/2013.20011) @2005en
dc.identifier.doihttps://doi.org/10.13031/2013.20011en
dc.identifier.issn0001-2351en
dc.identifier.urihttp://hdl.handle.net/10919/48209en
dc.identifier.urlhttp://elibrary.asabe.org/abstract.asp?aid=20011&t=3&dabs=Y&redir=&redirType=en
dc.language.isoenen
dc.publisherAmerican Society of Agricultural and Biological Engineersen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectNutrient managementen
dc.subjectPhosphorus managementen
dc.subjectSensitivity analysisen
dc.subjectRunoffen
dc.subjectModelen
dc.subjectTransporten
dc.subjectSiteen
dc.subjectAgricultural engineeringen
dc.titleSensitivity analysis of the Virginia phosphorus index management toolen
dc.title.serialTransactions of the ASAEen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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