1. Ammonia emissions from fertiliser
Nick Hutchings

2. Developments since last meeting
Revision was not completed in time for Zagreb
Ad hoc group formed to review and accept/reject revision
Revised methodology accepted

3. Developments since last meeting
Revision was not completed in time for Zagreb
Ad hoc group formed to review and accept/reject revision
Revised methodology accepted

4. Developments since last meeting
Revision was not completed in time for Zagreb
Ad hoc group formed to review and accept/reject revision
Revised methodology accepted
Pan, B. B., et al. (2016) Ammonia volatilization from synthetic fertilizers and its mitigation strategies: A global synthesis. Agriculture Ecosystems & Environment 223:
Focus on fertiliser type and abatement measures

5. Developments since last meeting
Revision was not completed in time for Zagreb
Ad hoc group formed to review and accept/reject revision
Revised methodology accepted
Pan, B. B., et al. (2016). "Ammonia volatilization from synthetic fertilizers and its mitigation strategies: A global synthesis." Agriculture Ecosystems & Environment 223:
Focus on fertiliser type and abatement measures
Identified further scientific studies
Incorporated into emission database

6. Developments since last meeting
Revision was not completed in time for Zagreb
Ad hoc group formed to review and accept/reject revision
Revised methodology accepted
Pan, B. B., et al. (2016) Ammonia volatilization from synthetic fertilizers and its mitigation strategies: A global synthesis. Agriculture Ecosystems & Environment 223:
Focus on fertiliser type and abatement measures
Identified further scientific studies
Incorporated into emission database
Re-analysed the data

7. Factors significantly affecting ammonia emission
Fertiliser type
Soil pH
Application method (e.g. broadcast, incorporated)
Crop (none, grass, cereal, maize, rice, trees)
Air temperature or rainfall (almost both)

8. Implications for Guidebook
No immediate changes 
Consider revision as part of the Guidebook maintenance plan
Will publish the revised model
Make available as a Tier 3 method
Note – data source was a highly significant variable
Systematic differences between studies that cannot be explained by the variables available
Included location (indoor/outdoor) and measurement method
Similar situation for ammonia emissions from manure
Needs further investigation