Granulated Saletrzak 27 contains 13.5% nitrogen in the ammonium form (NH 4), 13.5% nitrogen in the nitrate form (NO 3), as well as 4% magnesium (MgO) and 2% calcium (CaO) in a form easily accessible to the root system of plants, completely soluble in water. Saletrzak 27 is a mixture of ammonium nitrate with dolomite in one granule with a predominance of ammonium nitrate.