Potassium chloride is cheap, high in potassium content and good in quick solubility, and is generally used as base fertilizer and topdressing. However, the chlorine in potash fertilizer will harden the land, especially the saline-alkali land is not suitable for use. There are many saline-alkali land in Jilin province, and potassium sulfate is generally used as potassium fertilizer. Because potassium sulfate and potassium chloride contain a lot of. Sulfate ion and chloride ion. Long-term use can easily lead to calcium deficiency in crops. Causing the fruit to crack. The root tip turns black and stops growing. Yellow leaves, umbilical rot, etc. In addition, sulfate ion and chloride ion fertilizers are used for a long time.

The chlorine content of potassium sulfate is less than 3% or contains no chlorine, which is suitable for chlorine-free or chlorine-tolerant crops such as potatoes, tobacco and apples. Moreover, the potassium sulfate compound fertilizer produced with potassium sulfate as the main raw material is also a widely used compound fertilizer. Potassium chloride contains 50% ~ 60% potassium oxide. Mainly made of carnallite, potassium salt and brine. Potassium chloride is easily soluble in water, with a solubility of 34.7% at 20℃ and 55.7% at 100℃. It is a quick-acting fertilizer, which can be directly absorbed by plants.

No one is better, only according to the needs of crops, potassium nitrate is a binary compound fertilizer of nitrogen and potassium, and potassium dihydrogen phosphate is a binary compound fertilizer of phosphorus and potassium, depending on what crops need to supplement. Nitrate nitrogen in potassium nitrate is easily lost by rain, so it is not recommended to be used in paddy fields. Potassium nitrate. The main component is nitrogen fertilizer, with the content of 13.8% and potassium oxide content of 46.6%. Potassium nitrate does not contain chlorine fertilizer like potassium sulfate. The water solubility is very good, and both nitrogen fertilizer and potassium fertilizer can be well absorbed and utilized by crops.

Potassium nitrate is an efficient compound fertilizer containing potassium and nitrogen, which can achieve good results on various soils and crops, especially on chlorine-free crops such as tobacco, tomato, citrus and glucose. 6. The price of potassium nitrate is higher than that of potassium sulfate. Therefore, it is very economical to use potassium chloride for field crops that are not chlorine-free, because the content of high-purity potassium is 60% and the wholesale price is about 2250 yuan a ton. If it is a chlorine-free crop, potassium sulfate with 50% pure potassium can be used instead.