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dc.contributor.authorLaubach, J.en
dc.contributor.authorTaghizadeh Toosi, Arezooen
dc.contributor.authorGibbs, Steven J.en
dc.contributor.authorSherlock, Robert R.en
dc.contributor.authorKelliher, Francis M.en
dc.contributor.authorGrover, S. P. P.en
dc.identifier.citationLaubach et al. (2012). Ammonia emissions from cattle urine and dung excreted on pasture. Biogeosciences Discussions, 9, 13287-13318. doi:10.5194/bgd-9-13287-2012en
dc.description.abstractTwelve cattle were kept for three days in a circular area of 16 m radius on short pasture and fed with freshly-cut pasture. Ammonia (NH₃) emissions from the urine and dung excreted by the cattle were measured with a micrometeorological mass-balance method, during the cattle presence and for 10 subsequent days. Daily-integrated emission rates peaked on day 3 of the experiment (last day of cattle presence) and declined steadily for five days thereafter. Urine patches were the dominant sources for these emissions. On day 9, a secondary emissions peak occurred, with dung pats likely to be the main sources. This interpretation is based on simultaneous observations of the pH evolution in urine patches and dung pats created next to the circular plot. Feed and dung samples were analysed to estimate the amounts of nitrogen (N) ingested and excreted. Total N volatilised as NH₃ was 19.8 (±0.9) % of N intake and 22.4 (±1.3) % of N excreted. The bimodal shape of the emissions time series allowed to infer separate estimates for volatilisation from urine and dung, respectively, with the result that urine accounted for 88.6 (±2.6) % of the total NH₃ emissions. The emissions from urine represented 25.5 (±2.0) % of the excreted urine-N, while the emissions from dung amounted to 11.6 (±2.7) % of the deposited dung-N. Emissions from dung may have continued after day 13 but were not resolved by the measurement technique. A simple resistance model shows that the magnitude of the emissions from dung is controlled by the resistance of the dung crust.en
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionen
dc.relationThe original publication is available from - Copernicus Publications on behalf of the European Geosciences Union -
dc.rights© Author(s) 2012. CC Attribution 3.0 License.en
dc.subjectammonia emissionsen
dc.subjectMeteorology & Atmospheric Sciencesen
dc.titleAmmonia emissions from cattle urine and dung excreted on pastureen
dc.typeJournal Article
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Agricultural Sciencesen
lu.contributor.unitDepartment of Soil and Physical Sciencesen
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.subject.anzsrc0503 Soil Sciencesen
dc.subject.anzsrc040101 Atmospheric Aerosolsen
dc.subject.anzsrc0401 Atmospheric Sciencesen
dc.relation.isPartOfBiogeosciences Discussionsen
pubs.notesNote: first published in Biogeosciences Discussions (2012). This discussion paper is/has been under review for the journal Biogeosciences (BG). Please refer to the corresponding final paper in Biogeosciences:
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/AGSC
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/2018 PBRF Staff group

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