Crop emissions Nick Hutchings

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Presentation transcript:

Crop emissions Nick Hutchings Institute of Agroecology, University of Aarhus, Denmark

Conceptual model NH3 emission Time Fertiliser emission Crop emission Crop absorption NH3 emission Crop harvesting Fertiliser application Time

Guidebook emission factors Current emission factors account for: Emission from fertiliser Emission from crop immediately after fertiliser application Crop absorption (crudely) Current emission factors do not account for: Emission from senescing/diseased crops

Issues Other emissions are decreasing For modelling secondary PMs Crop emissions relatively more important For modelling secondary PMs Higher time resolution Higher spatial resolution Emissions depend on atmospheric NH3 concentrations Unfortunate combination: Low emission rate per ha x large number of ha Large uncertainty in emission rate per ha

Suggested way forward Review literature Talk to atmospheric modellers Part of Guidebook revision Lack information Talk to atmospheric modellers Discuss issue under Tier 3 methodology

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