Ammonium sulfate is a simple fertilizer containing only nitrogen. It is suitable for novices because it is relatively cheap and can maintain the effect for about a month after application.
The factory can add phosphate fertilizer and potassium fertilizer when producing this fertilizer, and use a roller granulator machine to make granules.
We supply many kinds of fertilizer granulating machine, disc granulator machine, rotary drum granulator, flat-die pellet mill, double roller press granulator. https://www.fertilizergranulator.com/fertilizer-granulator-machine-series/