Ammonia emissions from grazing

N. Vertregt, B. Rutgers

    Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic


    The ammonia-N emissions from artificially prepared urine patches on grassland on a sandy soil were measured with a wind tunnel method. Artificial urine with a N-content of 6-12 g/litre was applied at a rate of 5 litre/m2. At a urine application rate of 600 kg N/ha the ammonia-N emission varied between 6% and 19% (mean 13%) of the urine-N. It was argued that the emission rate is proportional to the urine-N concentration. The ammonia emission rate is 10% at an average urine-N concentration of 9 g/litre. The results of the emission measurements were confirmed by N-budget analyses of the urine patch system. The total ammonia emissions from grazed pastures at various levels of N-supply were calculated using known data on grass production, intake and digestion. The calculated ammonia-N emissions varied from 16 kg/ha at a N supply of 100 kg/ha to 38 kg/ha at a N-supply of 500 kg/ha. The calculated ammonia emissions were similar to the results of measurements in grazed fields with the micrometeorological mass balance method. At low levels of N-supply the mass balance data were disproportionally low, probably as a result of lower urine-N concentration during grazing and an underestimation of the emission by the mass balance method due to a relatively high background interference.
    Original languageEnglish
    Title of host publicationOdour and ammonia emissions from livestock farming
    Subtitle of host publicationProceedings of a seminar, Silsoe, UK, 26-28 March l990
    EditorsV.C. Nielsen, J.H. Voorburg, P. L'Hermite
    Place of PublicationLondon
    ISBN (Electronic)9780203215975
    ISBN (Print)9780367580087, 9781851667178
    Publication statusPublished - 1991


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