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Ammonia Emission Factors in Crop Production: A Comprehensive Review of Methodologies

This study reviews the current methodologies for estimating ammonia emissions from crop production, identifying the impacts of fertiliser type and application methods on emissions. Conducted by the Danish Centre for Environment and Energy, the research highlights significant variability in data collected worldwide, assessing factors such as temperature, soil type, and measurement techniques. The findings conclude that measurement methodology has minimal effect, while fertiliser type and the method of application, such as incorporation versus broadcast, are crucial. The study is intended for publication as a scientific paper.

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Ammonia Emission Factors in Crop Production: A Comprehensive Review of Methodologies

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  1. 4D Crop production – ammonia Rikke Albrektsen and Steen Gyldenkærne Danish Centre for Environment and Energy

  2. Background • During earlier Guidebook revision, Agriculture and Nature Expert Panel could not identify source of current methodology • Emission factors depended on: • Type of fertiliser • Temperature • Review of methodology was in Workplan • European Environment Agency funding

  3. Review of available data • Undertaken by Danish Centre for Environment and Energy • Part of Aarhus University • Overseen by TFEIP • Method: • Literaturesearch • Inquiriesamongstexperts • Worldwide data • All years

  4. Data collated • Ammonia emission • Country of origin • Location (laboratory, field) • Soil type • Cropping (bare soil, grass, cereal) • Application method • Air/soil temperature • Soilwetness/rainfall • Measurement method (e.g. wind tunnel)

  5. Data collated

  6. Results • No significant effect of measurement methodology (!) • Large variability in data • Significant effect of fertiliser type • Significant effect of application method • Broadcast versus incorporation • Effect of temperature?

  7. Results • No significanteffect of measurementmethodology (!) • Large variability in data • Significanteffect of fertiliser type • Significanteffect of applicationmethod • Broadcast versus incorporation • Effect of temperature? • Effect of pH?

  8. Conclusions • Currently no justification for including temperature or pH in emission estimations • ‘Noise’ overwhelms the chemistry • Make ammonia emissions from broadcast fertiliser only depend on type • Significant reductions with incorporation/injection • Intend to publish as scientific paper

  9. Emission factors

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