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The amount of nitrogen within a fertiliser that is made from ammonia as its source. The nitrogen content of the ammonia is expressed as NH3-N, whilst the ammonium content is NH4-N. Other forms of nitrogen will also be identified on a product label. An example is ICL Greenmaster Pro-Lite which has an N content of 11%, with this being supplied as Ammoniacal nitrogen of 5.6% (NH4-N) and Urea nitrogen of 5.4% (Ur-N).