Ammonium sulphate is a nitrogenous inorganic chemical fertilizer. Its chemical signal ( NH 4) 2 SO 4 . Ammonium sulfate is produced by the reaction of ammonia and sulfuric acid. Ammonium sulphate is a white granular substance. In aqueous solution it exhibits acidic properties. When the alkalinity of the soil becomes excessive, it is controlled by applying ammonium sulphate. It provides much needed nutrients and sulfur to plants