Analysis: 21-0-0-24S available in slightly varying analyses
Often abbreviated AS or AMS, Ammonium Sulphate is produced from a reaction of sulfuric acid and heated ammonia. AS is often a byproduct of other manufacturing processes, such as production of steel and nylon. Historically AS was one of the first and most commonly used dry fertilizer products, however it is currently not used as extensively since its N content is not as high as in other products like Urea and Ammonia. It is, however, still valued for S content and as a readily-available form of N.
Available from various external sources