1. Ammonia emissions from manure management
Nick Hutchings

2. Status Underlying methodology remains fit for purpose
Need to revise the equations to account for developments in manure management
Use of manure as a feedstock in biogas production (emissions calculated in 5.B.2) then return of digestate for field application (3D)
Increase in use of slurry separation?
Many new emissions measurements
Need for review of the scientific literature
Improved emission factors
Development of Tier 3 methodologies
Resources are an issue

3. Some progress
Collation of measurements of ammonia emission from field-applied manure
xx research organisations in Europe and N America
Lead by Sven Sommer (University of Southern Denmark)
Data added to those collated in an earlier exercise
Data will be available from
Most data for cattle slurry applied to grassland
Some data for pig slurry
Few data for other species or solid manure
Results will be published soon (later this year?)
Large differences between measurements from different institutes

4. Addition to Work Plan
Collation of measurements of ammonia emission from
Animal housing
Manure storage
Field-applied manures
Development of empirical models (Tier 3)
Improved Tier 2 method