First, in acidic soils, excess sulfate radicals will increase the acidity of the soil, and even aggravate the toxicity of active aluminum and iron in the soil to crops. Under flooding conditions, excessive sulfate radicals will be reduced to form hydrogen sulfide, which will damage the roots and turn black. Therefore, long-term application of potassium sulfate should be combined with farmyard manure, alkaline phosphate fertilizer and lime to reduce acidity. In practice, it should also be combined with drainage and drying measures to improve ventilation.
Second, in calcareous soil, sulfate and calcium ions in the soil produce calcium sulfate (gypsum), which is not easily soluble. Too much calcium sulphate will cause soil compaction. At this time, attention should be paid to increasing farm manure.
Third, focus on the use of chlorine-free crops, such as tobacco, tea trees, grapes, sugarcane, sugar beets, watermelons, potatoes, etc. The increased application of potassium sulfate will not only increase the yield, but also improve the quality. Potassium sulfate is more expensive than potassium chloride and has less supply. It should be used on economic crops that are sensitive to chlorine and that are sulfur- and potassium-loving, and the benefits will be better.
Fourth, this kind of fertilizer is a physiologically acidic salt, which can lower the pH of the soil when applied to alkaline soils.