(1) Content: Ammonium sulfate, abbreviated as ammonium sulfate, is an early variety of solid nitrogen fertilizer commonly referred to as standard nitrogen fertilizer; Containing 20% to 21% nitrogen.
(2) Property: ① The pure product is a white crystalline substance, often appearing slightly yellow with a small amount of impurities. ② Good physical properties, not hygroscopic or clumping. However, if too much sulfuric acid is added to the manufacturing process or the environmental humidity is high, it will absorb moisture and clump Easy to dissolve in water, fertilizer aqueous solution exhibits an acidic reaction Stable chemical properties, non volatile and non decomposing at room 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 Belonging to physiological acidic fertilizers, long-term application can enhance soil acidity. The application of ammonium sulfate in acidic soil can enhance the acidity of the soil, so lime should be added. However, it should be noted that lime and ammonium sulfate should be applied separately; Calcareous soil contains a large amount of Ca-CO3, and the application of ammonium sulfate has little effect on soil acidity, but it can cause ammonia volatilization loss, so it should be applied deeply.
(3) Application: ① Suitable as base fertilizer, topdressing, and seed fertilizer, with better effects as seed fertilizer and topdressing; If used as seed fertilizer, it should be mixed dry and sown as needed; It is best to mix the seeds with decomposed organic fertilizer in a certain proportion before mixing, to avoid excessive local salt concentration that may affect germination Suitable for various crops, sulfur loving crops have better application effects Rice fields should not be used for a long time. Long term application in paddy fields can cause a large accumulation of SO42- in the soil, leading to the production of FeS and H2S under anaerobic conditions, thereby affecting the respiration of rice roots and causing rice black root disease Deeply apply and cover with soil, especially on calcareous soil On the basis of organic fertilizer application, the application amount per mu is 15-25kg.
