（1）含量：硫酸銨簡稱硫銨，是應用較早的固態氮肥品種，一般稱為標準氮肥；含氮20%～21%。
(1) Content: ammonium sulfate, abbreviated as ammonium sulfate, is a solid-state nitrogen fertilizer variety applied earlier, which is generally called standard nitrogen fertilizer; The nitrogen content is 20% - 21%.
（2）性質：①純品為白色結晶，有少量雜質時多呈微黃色。②物理性狀良好，不吸濕、不結塊。但是，若制造過程加入過多硫酸或環境濕度大時，會吸濕結塊。③易溶于水，肥料水溶液呈酸性反應。④化學性質穩定，常溫常壓下不揮發、不分解。⑤堿性條件下，發生氨的揮發而損失氮。因此，硫酸銨不能與堿性物質混合貯存和施用。⑥屬于生理酸性肥料，長期施用會使土壤酸度增強。酸性土壤施用硫銨，會使土壤酸性增強，所以應配施石灰，但注意石灰與硫銨應分開施用；石灰性土壤含有大量Ca-CO3，施用硫銨對土壤酸度的影響較小，但會引起氨的揮發損失，所以應深施。
(2) Properties: ① the pure product is white crystal, and it is mostly yellowish when there is a small amount of impurities. ② Good physical properties, non hygroscopic, non caking. However, if too much sulfuric acid is added in the manufacturing process or the environmental humidity is high, moisture absorption and caking will occur. ③ It is easily soluble in water, and the aqueous solution of fertilizer reacts acidic. ④ It has stable chemical properties and does not volatilize or decompose under normal temperature and pressure. ⑤ Under alkaline conditions, ammonia volatilizes and nitrogen is lost. Therefore, ammonium sulfate cannot be mixed with alkaline substances for storage and application. ⑥ It belongs to physiologically acidic fertilizer, and long-term application will enhance the soil acidity. The application of ammonium sulfate in acid soil will enhance the acidity of the soil, so lime should be applied together, but it should be noted that lime and ammonium sulfate should be applied separately; Calcareous soil contains a lot of ca-co3. The application of ammonium sulfate has little effect on soil acidity, but it will cause ammonia volatilization loss, so it should be applied deeply.
（3）施用：①適宜作基肥、追肥和種肥，作種肥和追肥效果較好；若作拌種肥要干拌，且隨拌隨播；拌種時好與腐熟的有機肥以一定比例混勻后拌種，以免局部鹽分濃度過高，影響發芽。②適宜各種作物，喜硫作物施用效果更好。③稻田不宜長期施用。稻田長期施用會使SO42-在土壤中大量積累，嫌氣條件下產生FeS和H2S，從而影響水稻根系的呼吸，發生水稻的黑根病。④深施并覆土，特別是在石灰性土壤上。⑤在有機肥施用的基礎上，施用量為15～25kg。
(3) Application: ① it is suitable for base fertilizer, topdressing and seed fertilizer, and the effect of seed fertilizer and topdressing is better; If it is used as seed dressing fertilizer, it should be dry mixed and sown as soon as it is mixed; When mixing seeds, it is better to mix them with rotten organic fertilizer in a certain proportion before mixing seeds, so as to prevent local salt concentration from being too high and affecting germination. ② It is suitable for all kinds of crops, and the effect of sulfur loving crops is better. ③ Paddy fields should not be used for a long time. Long term application in paddy fields will cause a large amount of so42- to accumulate in the soil and produce FES and H2S under anaerobic conditions, thus affecting the respiration of rice roots and causing rice black root disease. ④ Apply deep and cover soil, especially on calcareous soil. ⑤ Based on the application of organic fertilizer, the application amount per mu is 15 ~ 25kg.
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