Effect of increasing the time between slurry application and first rainfall event on phosphorus concentrations in runoff

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dc.contributor.authorO'Rourke, Sharon M.
dc.contributor.authorFoy, Robert H.
dc.contributor.authorWatson, Catherine J.
dc.contributor.authorGordon, Alan Wesley
dc.contributor.authorHiggins, Suzanne
dc.contributor.authorVadas, Peter A.
dc.date.accessioned2021-08-16T13:16:22Z
dc.date.available2021-08-16T13:16:22Z
dc.date.issued2021-07-12
dc.descriptionPublication history: Accepted - 26 May 2021; Published online - 12 August 2021.en_US
dc.description.abstractMinimizing slurry phosphorus (P) losses in runoff requires careful management in the context of both soil P surpluses and changing patterns in rainfall. Increasing the time interval between slurry application and the first rainstorm event is known to reduce P loss in runoff although the risk period for elevated P concentrations in runoff can extend for weeks. This study investigated the impact of increasing the time interval between slurry application and first rainstorm event on P concentrations in runoff. Simulated rainfall (40 mm h−1) was applied at 2, 4, 10, 18, 30 and 49 days after dairy slurry was surface-applied to a grassland sward in Ireland. Increasing time to runoff resulted in a decrease in dissolved reactive P concentrations from 5.0 to 1.0 mg P L−1 and a P signal in runoff for 18 days. Beyond 18 days, elevated P concentrations were observed in runoff collected from natural rainfall that preceded the day 49 rainstorm event. A published surface phosphorus and runoff model (SurPhos) was used to understand the slurry P dynamics controlling P interactions with runoff. Dissolved reactive P in runoff was predicted with accuracy by SurPhos, R2 = .89. The SurPhos model implied that slurry P mineralization occurred during the experimental period that resulted in a small spike in P concentrations beyond the defined risk period. This study shows that the experimental data have the potential to be extrapolated to different weather scenarios using SurPhos and could test when and where slurry P could be most safely spread.en_US
dc.description.sponsorshipOpen access funding provided by IReL. WOA Institution: University College Dublin Blended DEAL: IReL.en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/347
dc.identifier.citationO’Rourke, S. M., Foy, R. H., Watson, C. J., Gordon, A., Higgins, S. and Vadas, P. A. (2021) ‘Effect of increasing the time between slurry application and first rainfall event on phosphorus concentrations in runoff’, Soil Use and Management. doi: 10.1111/sum.12732.en_US
dc.identifier.issn0266-0032
dc.identifier.issn1475-2743
dc.identifier.urihttps://doi.org/10.1111/sum.12732
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rights© 2021 The Authors. Soil Use and Management published by John Wiley & Sons Ltd on behalf of British Society of Soil Science. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en_US
dc.subjectgrasslanden_US
dc.subjectphosphorusen_US
dc.subjectrainfall timingen_US
dc.subjectrunoffen_US
dc.subjectSurPhos modelen_US
dc.titleEffect of increasing the time between slurry application and first rainfall event on phosphorus concentrations in runoffen_US
dc.typeArticleen_US
dcterms.dateAccepted2021-05-26
dcterms.dateSubmitted2020-11-20

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