（1）含量：硫酸铵简称硫铵，是应用较早的固态氮肥品种，一般称为标准氮肥；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）性质：①纯品为白色结晶，有少量杂质时多呈微黄色。②物理性状良好，不吸湿、不结块。但是，若制造过程加入过多硫酸或环境湿度大时，会吸湿结块。③易溶于水，肥料水溶液呈酸性反应。④化学性质稳定，常温常压下不挥发、不分解。⑤碱性条件下，发生氨的挥发而损失氮。因此，硫酸铵不能与碱性物质混合贮存和施用。⑥属于生理酸性肥料，长期施用会使土壤酸度增强。酸性土壤施用硫铵，会使土壤酸性增强，所以应配施石灰，但注意石灰与硫铵应分开施用；石灰性土壤含有大量Ca-CO3，施用硫铵对土壤酸度的影响较小，但会引起氨的挥发损失，所以应深施。
(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适宜作基肥、追肥和种肥，作种肥和追肥效果较好；若作拌种肥要干拌，且随拌随播；拌种时好与腐熟的有机肥以一定比例混匀后拌种，以免局部盐分浓度过高，影响发芽。②适宜各种作物，喜硫作物施用效果更好。③稻田不宜长期施用。稻田长期施用会使SO42-在土壤中大量积累，嫌气条件下产生FeS和H2S，从而影响水稻根系的呼吸，发生水稻的黑根病。④深施并覆土，特别是在石灰性土壤上。⑤在有机肥施用的基础上，施用量为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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