Journal article

Ammonia emissions from irrigated pastures on Solonetz in Victoria, Australia

Owen Thomas Denmead, Mei Bai, Debra Turner, Yong Li, Robert Edis, Deli Chen

Geoderma Regional | ELSEVIER | Published : 2020


This paper reports ammonia (NH ) emissions from irrigated, fertilized pastures grazed intensively by dairy cattle in Victoria, Australia. Irrigation bays (65 × 365 m) were grazed in rotation by 315 dairy cattle and daily emissions were measured in summer and autumn. After grazing for a few days, the bays were fertilized with urea at 50 kg N ha and irrigated with 50 mm of water. Passive NH samplers were used to measure horizontal fluxes of NH from different sectors of the bays directly and the corresponding surface emissions were calculated from the sampler data using a backward Lagrangian stochastic (bLs) model of atmospheric dispersion. Ammonia emissions from the whole herd during the gr..

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Funding Acknowledgements

This projectwas supported by the University of Melbourne-CSIRO Collaborative Research Program and the Greenhouse in Agriculture Program of the CRC for Greenhouse Accounting. We thank the CRC andDepartment of Primary Industry Victoria for making available micrometeorological data from the Kyabram site. We are grateful for the help of staff at Kyabram and Tatura research farms, particularly Kevin Kelly, Rob Baigent, Frances Phillips. Thanks Thomas K Flesch for his useful comments. Many thanks to Tony Weatherley for providing the soil information.