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dc.contributor.authorSerrenho, Ana
dc.contributor.authorHealy, Mark G.
dc.identifier.citationSerrenho, A., Fenton, O., Murphy, P.N.C., Grant, J., Healy, M.G. (2012) 'Effect of chemical amendments to dairy soiled water and time between application and rainfall on phosphorus and sediment losses in runoff'. Science Of The Total Environment, 430 :1-7.en_US
dc.description.abstractDairy soiled water (DSW) is a dilute, low nutrient effluent produced on Irish dairy farms through the regular washing down of milking parlours and holding areas. In Ireland, there is no closed period for the land application of DSW except where heavy rain is forecast within 48 h. Chemical amendments have the potential to decrease phosphorus (P) and suspended sediment (SS) loss from DSW applied to land. This study examined the impact of three time intervals (12, 24 and 48 h) between DSW application and rainfall and five treatments (control, unamended DSW, and DSW amended with lime, alum or ferric chloride (FeCl2)) on P and sediment losses from an intact grassland soil in runoff boxes. Rainfall was simulated at 10.5±1 mm h-1. Phosphorus concentrations (1-1.6 mg L-1) in runoff from DSW application, while not quantitative measures of P loss to surface waters in the field, indicated the importance of incidental P losses and that the current 48 h restriction in Ireland is prudent.  Unamended DSW application increased P loss by, on average, 71 %, largely due to an increase in particulate phosphorus (PP) loss. All three amendments were effective in decreasing P and SS losses in runoff and, apart from the SS results for lime, were significantly different (p<0.05) to the control at at least one time point. Lime (a 64 % reduction in total phosphorus (TP) in comparison with DSW only) was less effective than alum or FeCl2, likely due to the lower solubility of CaCO3 in water. Chemical amendment showed potential to decrease P losses from land application of DSW, but the efficacy of such amendments would need to be assessed in field trials and a cost-benefit analysis conducted to further examine whether they could be practically implemented on farms.en_US
dc.description.sponsorshipDepartment of Agriculture, Fisheries and Food - Research Stimulus Programme 2007 (RSF 07 525).en_US
dc.relation.ispartofScience Of The Total Environmenten
dc.subjectDairy soiled wateren_US
dc.subjectFarm effluenten_US
dc.subjectApplication timingen_US
dc.subjectIncidental lossen_US
dc.subjectChemical amendmenten_US
dc.titleEffect of chemical amendments to dairy soiled water and time between application and rainfall on phosphorus and sediment losses in runoffen_US
dc.contributor.funder|~|Dept of Agriculture & Food |~|
dc.local.contactMark Healy, Dept. Of Civil Engineering, Room E210, Civil Engineering Building, Nui Galway. 5364 Email:

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