1. Measurement and mitigation of nitrous oxide emissions from a high nitrogen input vegetable system.
- Author
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Lam, Shu Kee, Suter, Helen, Davies, Rohan, Bai, Mei, Sun, Jianlei, and Chen, Deli
- Subjects
NITROUS oxide ,EMISSIONS (Air pollution) ,NITROGEN content of vegetables ,FOURIER transform infrared spectroscopy ,NITRIFICATION - Abstract
The emission and mitigation of nitrous oxide (N
2 O) from high nitrogen (N) vegetable systems is not well understood. Nitrification inhibitors are widely used to decrease N2 O emissions in many cropping systems. However, most N2 O 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 N2 O 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 N2 O 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 N2 O emission by 37-44%, even though the N2 O 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 N2 O emission from intensive vegetable production systems, and that the national soil N2 O emission inventory assessments and modelling predictions may vary with gas measurement techniques. [ABSTRACT FROM AUTHOR]- Published
- 2015
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