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Incidental phosphorus and nitrogen loss from grassland plots receiving chemically amended dairy cattle slurry.

ARAN - Access to Research at NUI Galway

Show simple item record Brennan, Raymond B. Healy, Mark G. 2012-11-21T12:33:30Z 2012-11-21T12:33:30Z 2012-09
dc.identifier.citation Brennan, R.B., Healy, M.G., Grant, J., Ibrahim, T.G., Fenton, O. (2012) 'Incidental phosphorus and nitrogen loss from grassland plots receiving chemically amended dairy cattle slurry'. Science Of The Total Environment, 441 :132-140. en_US
dc.identifier.issn 0048-9697
dc.description Journal article en_US
dc.description.abstract Chemical amendment of dairy cattle slurry has been shown to effectively reduce incidental phosphorus (P) losses in runoff; however, the effects of amendments on incidental nitrogen (N) losses are not as well documented. This study examined P and N losses in runoff during three simulated rainfall events 2, 10 and 28 days after a single application of unamended/chemically amended dairy cattle slurry. Twenty-five hydraulically isolated plots, each measuring 0.9 m by 0.4 m and instrumented with runoff collection channels, were randomly assigned the following treatments: (i) grass-only, (ii) slurry-only (the study-control), (iii) slurry amended with industrial grade liquid alum comprising 8% Al2O3, (iv) slurry amended with industrial grade liquid poly-aluminum chloride (PAC) comprising 10% Al2O3, and (v) slurry amended with lime. During the first rainfall event, lime was ineffective but alum and PAC effectively reduced dissolved reactive P (DRP) (by 95 and 98%, respectively) and total P (TP) flow-weighted-mean-concentrations (by 82 and 93%, respectively) in runoff compared to the study-control. However, flow-weighted-mean-concentrations of ammonium-N (NH4-N) in runoff were increased with alum- (81%) and lime-treated (11%) slurry compared to the study-control whereas PAC reduced the NH4-N by 82%. Amendments were not observed to have a significant effect on NO3-N losses during this study. Slurry amendments reduced P losses for the duration of the study, whereas the effect of amendments on N losses was not significant following the first event. Antecedent volumetric water content of the soil or slope of the plots did not appear to affect runoff volume. However, runoff volumes (and consequently loads of P and N) were observed to increase for the chemically amended plots compared to the control and soil-only plots. This work highlights the importance of considering both P and N losses when implementing a specific nutrient mitigation measure. en_US
dc.description.sponsorship Teagasc (Walsh Fellowship) en_US
dc.format application/pdf en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartof Science Of The Total Environment en
dc.subject Alum en_US
dc.subject Poly-aluminum chloride en_US
dc.subject Lime en_US
dc.subject Runoff en_US
dc.subject Amendments en_US
dc.subject Management en_US
dc.title Incidental phosphorus and nitrogen loss from grassland plots receiving chemically amended dairy cattle slurry. en_US
dc.type Article en_US 2012-11-08T18:56:00Z
dc.local.publishedsource en_US
dc.description.peer-reviewed peer-reviewed
dc.contributor.funder |~|Other|~|
dc.internal.rssid 2709324 Mark Healy, Dept. Of Civil Engineering, Room E210, Civil Engineering Building, Nui Galway. 5364 Email:
dc.local.copyrightchecked Yes
dc.local.version ACCEPTED

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