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dc.contributor.authorMurphy, Paul N. C.
dc.contributor.authorMellander, Per-Erik
dc.contributor.authorMelland, A. R.
dc.contributor.authorBuckley, Cathal
dc.contributor.authorShore, Mairead
dc.contributor.authorShortle, Ger
dc.contributor.authorWall, David
dc.contributor.authorTreacy, Mark
dc.contributor.authorShine, Oliver
dc.contributor.authorMechan, Sarah
dc.contributor.authorJordan, Philip
dc.date.accessioned2020-07-02T13:50:06Z
dc.date.available2020-07-02T13:50:06Z
dc.date.issued2015-04-20
dc.identifier.citationMurphy, P., Mellander, P., Melland, A., Buckley, C., Shore, M., Shortle, G., Wall, D., Treacy, M., Shine, O., Mechan, S. and Jordan, P. Variable response to phosphorus mitigation measures across the nutrient transfer continuum in a dairy grassland catchment. Agriculture, Ecosystems & Environment, 2015, 207, 192-202. doi: https://doi.org/10.1016/j.agee.2015.04.008en_US
dc.identifier.urihttp://hdl.handle.net/11019/2118
dc.descriptionpeer-revieweden_US
dc.description.abstractPhosphorus (P) loss from soils to water can be a major pressure on freshwater quality and dairy farming, with higher animal stocking rates, may lead to potentially greater nutrient source pressures. In many countries with intensive agriculture, regulation of P management aims to minimise these losses. This study examined the P transfer continuum, from source to impact, in a dairy-dominated, highly stocked, grassland catchment with free-draining soils over three years. The aim was to measure the effects of P source management and regulation on P transfer across the nutrient transfer continuum and subsequent water quality and agro-economic impacts. Reduced P source pressure was indicated by: (a) lower average farm-gate P balances (2.4 kg ha−1 yr−1), higher P use efficiencies (89%) and lower inorganic fertilizer P use (5.2 kg ha−1 yr−1) relative to previous studies; (b) almost no recorded P application during the winter closed period, when applications were prohibited, to avoid incidental transfers; and (c) decreased proportions of soils with excessive P concentrations (32–24%). Concurrently, production and profitability remained comparable with the top 10% of dairy farmers nationally with milk outputs of 14,585 l ha−1, and gross margins of € 3130 ha−1. Whilst there was some indication of a response in P delivery in surface water with declines in quick flow and interflow pathway P concentrations during the winter closed period for P application, delayed baseflows in the wetter third year resulted in elevated P concentrations for long durations and there were no clear trends of improving stream biological quality. This suggests a variable response to policy measures between P source pressure and delivery/impact where the strength of any observable trend is greater closer to the source end of the nutrient transfer continuum and a time lag occurs at the other end. Policy monitoring and assessment efforts will need to be cognisant of this.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesAgriculture, Ecosystems & Environment;Vol. 207
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectPhosphorus lossen_US
dc.subjectNutrient transfer continuumen_US
dc.subjectWater qualityen_US
dc.subjectMitigation measuresen_US
dc.subjectNutrient managementen_US
dc.subjectAgricultural catchmenten_US
dc.subjectComparative economicsen_US
dc.titleVariable response to phosphorus mitigation measures across the nutrient transfer continuum in a dairy grassland catchmenten_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.1016/j.agee.2015.04.008
dc.contributor.sponsorDepartment of Agriculture, Food and Marineen_US
refterms.dateFOA2020-07-02T13:50:06Z


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