Ferrous Ammonium Sulphate is also called Mohr’s salt a light green color sand like crystalline solid. It is a hazardous substance and preparation of ferrous ammonium sulfate is carried out from equimolar mixture of hydrated ferrous sulphate and ammonium sulphate in water; containing a little of sulphuric acid.

Ferrous Ammonium Sulfate is in the manufacture of iron blue; in the metal industry as an ingredient of brass colouring baths and iron plating solutions; and as a substitute for ferrous sulfate in a number of fields.

Correction of an iron deficiency can be accomplished by including iron sulfate, chelated iron, or ferrous ammonium sulfate with pesticide spray applications or by use of complete analysis fertilizers, which contain iron.

Ferrous ammonium sulfate, the most common and usually the least expensive, contains 21 percent iron. Ferrous sulfate is the quickest-acting material; it improves turf colour within a couple of days, but the improvement does not last long.