Ammonia emission from synthetic fertilizers

The data consists of measured estimates of the emission of ammonia from synthetic nitrogen fertilizers applied to the soil in either the field or laboratory. The emission is expressed as the percentage of nitrogen applied that is emitted as ammonia. The data were collated from published reports, following a search with global scope. The data do not include the results of experiments using anhydrous ammonia or where fertilizer was applied to paddy rice. A range of explanatory variables were also collated, including fertilizer type, application method, soil characteristics, weather conditions and measurement method.