Rivedal, Synnøve; Prestvik, Anne Strøm; Aune, Anders; Hansen, Sissel and Morken, John (2019) Tiltak for å redusere ammoniakkutslepp frå jordbruket. [Measures to reduce ammonia volatilization from agriculture.] NIBIO-rapport, no. 5 / 160. NIBIO, Ås, Norway.