Fertilizer Grade N:20.5%min Size:2--5mm Factory,SGS,Intertek,BV. ISO9001:2008 GB/T 19001-2008 Our Specification:Nitrogen content % (Based on dry basis) min20.5Moisture % max2Application:In agriculture,used for nitrogen fertilizer,making compund fertilizerHow to Control the Quality,Service and Price:1.Quality: A. We have own factories of ammonium sulphate granular. B. We have own warehouse and ...