title: Measurement and mitigation of nitrous oxide emissions from a high nitrogen input vegetable system.
abstract: The emission and mitigation of nitrous oxide (N2O) from high nitrogen (N) vegetable systems is not well understood. Nitrification inhibitors are widely used to decrease N2O emissions in many cropping systems. However, most N2O flux measurements and inhibitor impacts have been made with small chambers and have not been investigated at a paddock-scale using micrometeorological techniques. We quantified N2O fluxes over a four ha celery paddock using open-path Fourier Transform Infrared spectroscopy in conjunction with a backward Lagrangian stochastic model, in addition to using a closed chamber technique. The celery crop was grown on a sandy soil in southern Victoria, Australia. The emission of N2O was measured following the application of chicken manure and N fertilizer with and without the application of a nitrification inhibitor 3, 4-dimethyl pyrazole phosphate (DMPP). The two techniques consistently demonstrated that DMPP application reduced N2O emission by 37-44%, even though the N2O fluxes measured by a micrometeorological technique were more than 10 times higher than the small chamber measurements. The results suggest that nitrification inhibitors have the potential to mitigate N2O emission from intensive vegetable production systems, and that the national soil N2O emission inventory assessments and modelling predictions may vary with gas measurement techniques.
authors: Crop and Soil Science Section, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia.
authors: Shu Kee
authors: SK
authors: Lam
authors: Crop and Soil Science Section, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia.
authors: Helen
authors: H
authors: Suter
authors: BASF Australia Ltd., Level 12, 28 Freshwater Place, Southbank, Victoria 3006, Australia.
authors: Rohan
authors: R
authors: Davies
authors: Crop and Soil Science Section, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia.
authors: Mei
authors: M
authors: Bai
authors: Crop and Soil Science Section, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia.
authors: Jianlei
authors: J
authors: Sun
authors: Crop and Soil Science Section, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia.
authors: Deli
authors: D
authors: Chen
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis / Q000378:metabolism; D000077102:Apium / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism*; D009609:Nitrous Oxide / Q000032:analysis* / Q000378:metabolism; D011720:Pyrazoles / Q000494:pharmacology; D012987:Soil / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C433304:3,4-dimethylpyrazole phosphate; D064751:Ammonium Compounds; D011720:Pyrazoles; D012987:Soil; D009609:Nitrous Oxide; D009584:Nitrogen