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dc.contributor.authorEason, Nathaniel Paul
dc.date.accessioned2014-03-04T18:27:35Z
dc.date.available2014-03-04T18:27:35Z
dc.date.issued2010-05
dc.identifier.othereason_nathaniel_p_201005_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/eason_nathaniel_p_201005_ms
dc.identifier.urihttp://hdl.handle.net/10724/26307
dc.description.abstractInformation on nitrogen inputs and outputs for southeastern US pasture-based dairies is very limited. The first objective of this research was to estimate N losses via ammonia volatilization, nitrous oxide emissions, and nitrate leaching on two pasture-based dairies located in the Coastal Plain of Georgia (U.S.). The second objective was to create a one-year N balance for the two dairies. Nitrogen inputs were obtained from farm records. Nitrogen outputs included milk export, ammonia volatilization, nitrous oxide emission, and nitrate leaching. A micrometeorological passive flux method measured ammonia. Nitrous oxide emissions were measured using closed chambers in the field. Cup lysimeters were installed at 1-m depth to measure NO3 leaching. Total N inputs were similar for both farms and so was N exported in milk when expressed as percentage of N inputs. However, ammonia and nitrate losses were very different between farms because of differences in N management practices.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectGrass-based dairies
dc.subjectN balance
dc.subjectEnvironmental impact
dc.subjectDairy
dc.subjectNitrate
dc.subjectAmmonia
dc.titleNitrogen dynamics on pasture-based dairy farms in Georgia
dc.typeThesis
dc.description.degreeMS
dc.description.departmentCrop and Soil Sciences
dc.description.majorAgronomy
dc.description.advisorMiguel L. Cabrera
dc.description.committeeMiguel L. Cabrera
dc.description.committeeNick S Hill
dc.description.committeeDennis Hancock


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