BMP impacts on sediment and nutrient yields from an agricultural watershed in the coastal plain region

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dc.contributorVirginia Techen
dc.contributor.authorInamdar, S. P.en
dc.contributor.authorMostaghimi, Saieden
dc.contributor.authorMcClellan, P. W.en
dc.contributor.authorBrannan, Kevin M.en
dc.contributor.departmentBiological Systems Engineeringen
dc.date.accessed2014-05-29en
dc.date.accessioned2014-05-30T13:13:50Zen
dc.date.available2014-05-30T13:13:50Zen
dc.date.issued2001en
dc.description.abstractThe goal of the Nomini Creek watershed monitoring study was to quantify the effectiveness of BMPs at the watershed scale and to determine if the improvements in water quality could be sustained over a long-term period. Information on the long-term effectiveness of BMPs is critical since BMPs are being implemented under the state cost-share program to reduce nonpoint source pollution (NPS) to the Chesapeake Bay. The Nomini Creek project started in 1985 and was completed in 1997. A pre- versus post-BMP design was used. A combination of managerial and structural BMPs was implemented. Major BMPs implemented in the Nomini Creek watershed included no-tillage, filter strips, and nutrient management. The data collected at the 1463 ha Nomini Creek watershed consisted of land use, hydrologic, water quality, soils, and geographical information. The BMPs implemented at Nomini Creek reduced average annual loads and flow-weighted concentrations of nitrogen (N) by 26% and 41%, respectively. Average annual total-N loads discharged from the watershed were reduced from 9.57 kg/ha during the pre-BMP period to 7.05 kg/ha for the post-BMP period. Largest reductions were observed for dissolved ammonium-N, soluble organic-N, and particulate-N. In contrast, nitrate-N loads increased after BMP implementation. Increase in nitrate exports was likely due to ammonfication and nitrification, and subsequent leaching of particulate-N species that were conserved on the field. In comparison to N, reductions in phosphorus (P) loads and concentrations were not significant. BMP implementation resulted in a mere 4% reduction for total-P with a corresponding 24% reduction in flow-weighted concentration. The average annual total-P loads exported from the watershed were 1.31 and 1.26 kg/ha for the pre- and post-BMP periods, respectively. Reductions in total-P loads were due to decreases in particulate-P. Exports of ortho-P and dissolved organic-P increased after BMP implementation. It is likely that some of this post-BMP increase in dissolved P fractions was associated with dissolution and leaching of particulate-P, and higher rainfall-runoff activity in the watershed during the post-BMP period. In comparison to nutrients, there was no significant change in suspended solids discharged from the watershed. Overall, the findings of this study indicate that the BMPs were effective in reducing the losses of some forms of nutrients, such as ammonium-N and particulate-P, from the Nomini Creek watershed, but additional BMIs are necessary to achieve significant reductions in all forms of N and P.en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationInamdar, S. P.; Mostaghimi, S.; McClellan, P. W.; Brannan, K. M., "BMP impacts on sediment and nutrient yields from an agricultural watershed in the coastal plain region," Transactions of the ASAE. Vol. 44(5): 1191-1200. (doi: 10.13031/2013.6449) @2001en
dc.identifier.doihttps://doi.org/10.13031/2013.6449en
dc.identifier.issn0001-2351en
dc.identifier.urihttp://hdl.handle.net/10919/48214en
dc.identifier.urlhttp://elibrary.asabe.org/abstract.asp?aid=6449&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.subjectMonitoringen
dc.subjectNPSen
dc.subjectBmpsen
dc.subjectAgricultural runoffen
dc.subjectNitrogenen
dc.subjectPhosphorusen
dc.subjectWateren
dc.subjectQualityen
dc.subjectNo-tillen
dc.subjectCornen
dc.subjectPhosphorusen
dc.subjectQualityen
dc.subjectLossesen
dc.subjectSoilen
dc.subjectDischargeen
dc.subjectNitrogenen
dc.subjectRunoffen
dc.subjectStreamen
dc.subjectAgricultural engineeringen
dc.titleBMP impacts on sediment and nutrient yields from an agricultural watershed in the coastal plain regionen
dc.title.serialTransactions of the ASAEen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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