Keywords In 2009 a group of companies were assembled (Aarhus University, SEGES, BioCover A/S and Grundfos ) and committed to a joint development project "SyreN" -technology for field acidification of slurry, with support from the Danish ministry for development and innovation. The group defined and created a demand specification for using sulfuric acid together with a slurry tanker during application with the purpose of reducing ammonia emission, later called "field acidification". Another

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... t of the sulfuric acid was the addition of sulphate to slurry. Following a successful research evaluation, the system was developed by BioCover to a pilot scale system for tests and following used in commercial slurry application. The commercial product was named SyreN. Today 120 SyreN units are operative in Denmark, acidifying approx. 5.350.000 m 3 slurry/year, and do so with an acid amount that often corresponds with the sulphur need by the crops. SyreN system, acidification, ammonia emission