Potassium sulfate is a colorless crystal with low hygroscopicity, good physical properties and convenient application. It is a good 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 suitable for planting chlorine-sensitive crops such as tobacco, grapes, beets, tea, potatoes, flax and various fruit trees. It is also the main raw material of high-quality nitrogen, phosphorus and potassium ternary compound fertilizer.
Potassium sulfate compound fertilizer is produced by low temperature conversion of potassium chloride, chemical synthesis and guniting granulation. Good stability, not only contains three main nutrients necessary for plants, but also contains trace elements such as sulfur, calcium, magnesium, zinc, iron and copper. This fertilizer is suitable for all kinds of cash crops, especially those sensitive to chlorine. The main components of potassium sulfate compound fertilizer are MAP (monoammonium phosphate) DAP (diammonium phosphate) and ammonium sulfate (mainly obtained by neutralizing excess sulfuric acid with ammonia at low temperature). There are other impurities such as potassium sulfate and urea, such as calcium sulfate, iron, aluminum, magnesium phosphate, and a small amount of unreacted potassium chloride.
Precautions for use
First, in acidic soil, excessive sulfate will aggravate the acidity of the soil, and even aggravate the toxicity of active aluminum and iron in the soil to crops. In the case of flooding, excessive sulfate will be reduced to produce hydrogen sulfide, which will make the root system black. Therefore, long-term application of potassium sulfate should be combined with farm manure, alkaline phosphate fertilizer and lime to reduce acidity, and drainage and field drying measures should be combined in practice to improve ventilation.
Secondly, in calcareous soil, sulfate radicals and calcium ions in the soil generate insoluble calcium sulfate (gypsum). Too much calcium sulfate will cause soil hardening, so more farmyard manure should be applied at this time.
Thirdly, the application of potassium sulfate to chlorine-free crops such as tobacco, tea, grapes, sugar cane, sugar beet, watermelon and potato can not only improve the yield, but also improve the quality. Potassium sulfate is more expensive than potassium chloride, and its supply is less. It should be mainly used in cash crops that are sensitive to chlorine and like sulfur and potassium, and the benefits will be better.
Fourthly, this fertilizer is a kind of physiological acid salt, which can reduce the PH value of soil when applied to alkaline soil.