Ammonia flux into the atmosphere from a grazed pasture. 
A micrometeorological technique has been used to measure the flux of ammonia and related gaseous nitrogen compounds into the atmosphere from a pasture grazed by sheep.  During 3 weeks in late summer, the average daily flux density of nitrogen in these forms was 0.26 kilogram per hectare.  This is a substantial part of the nitrogen turnover in grazed pastures.