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Abstract
The ammonia emission after manure application is still an uncertain factor in the Dutch national ammonia emission budget. The bulk of the emission occurs in the first hours after manure application. The total amount emitted depends strongly on weather conditions, field conditions and on the application technique used. The emissions associated with different application techniques were evaluated in the past on experimental plots on test farms, but how do these techniques perform in everyday life on working farms?
We report here how to measure the ammonia emission of a field with our mobile lidar system. This system was developed and built by RIVM. It measures a two-dimensional ammonia concentration profile, downwind from a manured field. This is combined with wind measurements to compute the ammonia emission. The instrument was tested in a field campaign, both on a test farm and on a working farm. Its results were compared to those from another novel instrument, a mobile TDL spectrometer built by ECN. The results compare well. The results were also compared to those from a mass balance experiment by WUR, an established measurement technique.