Ammonia emissions from manure management Nick Hutchings

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

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 www.alfam.dk 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

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