Ammonium sulfate is a kind of nitrogen fertilizer, which contains a large amount of elemental nitrogen and a moderate amount of elemental sulfur. Its advantages are relatively small hygroscopicity, not easy to agglomerate, and it has good physical properties and chemical stability compared with ammonium nitrate and ammonium bicarbonate. Ammonium sulfate is a quick fertilizer, suitable for alkaline soil, can be used as base fertilizer, topdressing and seed fertilizer, can make branches and leaves grow vigorously, improve fruit quality and yield, enhance crop stress resistance.