Potassium sulfate is a colorless crystalline substance with low hygroscopicity, not easily clumped, good physical properties, easy to apply, and is a very water-soluble potassium fertilizer. Potassium sulfate is also a chemically neutral and physiologically acidic fertilizer. Potassium sulfate is a chlorine free, high-quality, and efficient potassium fertilizer, especially in the cultivation of chlorine sensitive crops such as tobacco, grapes, sugar beets, tea trees, potatoes, flax, and various fruit trees. It is an indispensable and important fertilizer; It is also the main raw material for high-quality nitrogen, phosphorus, and potassium ternary compound fertilizers.
Potassium sulfate type compound fertilizer is produced using low-temperature conversion, chemical synthesis, and spray granulation processes of potassium chloride. It has good stability and contains essential nutrients such as N, P, and K for plants, as well as trace elements such as S, Ca, Mg, Zn, Fe, and Cu. This fertilizer is suitable for various economic crops, especially chlorine sensitive crops. The main components of potassium sulfate compound fertilizer are MAP (monoammonium phosphate) and DAP (diammonium phosphate), and ammonium sulfate (mainly obtained by low-temperature conversion of surplus sulfuric acid and gas ammonia neutralization). Potassium sulfate, urea, and other small amounts of impurities such as calcium sulfate, iron, aluminum, magnesium salts of phosphate, and trace amounts of unreacted potassium chloride.
Precautions for use
Firstly, in acidic soils, excess sulfate ions can exacerbate soil acidity and even increase the toxicity of active aluminum and iron to crops. Under flooded conditions, excessive sulfate ions will be reduced to produce hydrogen sulfide, causing damage to the roots and turning them black. Therefore, long-term application of potassium sulfate should be combined with farmyard manure, alkaline phosphate fertilizer, and lime to reduce acidity. In practice, drainage and sun drying measures should also be combined to improve ventilation.
Secondly, in calcareous soil, sulfate ions react with calcium ions in the soil to form insoluble calcium sulfate (gypsum). Excessive calcium sulfate can cause soil compaction, and it is important to increase the application of farmyard manure.
Thirdly, it is important to use potassium sulfate on chlorine tolerant crops such as tobacco, tea trees, grapes, sugarcane, sugar beets, watermelons, potatoes, etc. Increasing the application of potassium sulfate not only increases yield but also improves quality. Potassium sulfate is more expensive than potassium chloride and has limited supply. Therefore, it should be mainly used in cash crops that are sensitive to chlorine and prefer sulfur and potassium, which will yield better benefits.
Fourthly, this fertilizer is a physiologically acidic salt, which can lower the soil pH value when applied to alkaline soil.
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