What is the difference between potassium sulfate compound fertilizer and potassium chloride compound fertilizer?

What is the difference between potassium sulfate compound fertilizer and potassium chloride compound fertilizer? Do netizens who know about it help to introduce that potassium sulfate compound fertilizer and potassium chloride compound fertilizer are the most common chemical fertilizer varieties in the agricultural material market, but their application objects and fertilizer effects are very different? therefore, the land planting network has sorted out the difference between potassium sulfate compound fertilizer and potassium chloride compound fertilizer, which is listed in detail for netizens' reference. First, physical properties: potassium sulfate: soluble in water, 50% K2O content, white or reddish crystal, better physical properties than potassium chloride, low hygroscopicity, not easy to agglomerate during storage, and belongs to acidic fertilizer. Potassium chloride: water-soluble quick-acting potash fertilizer, K2O content is 50%, white or yellowish or purplish red, hygroscopicity, caking in storage, rainproof, moisture-proof and packaging damage, it is an acidic fertilizer. Second, suitable for crops: potassium sulfate is especially effective for all kinds of crops, especially cruciferous crops, and is not as effective as potassium chloride for rice. Because potassium sulfate is easy to produce hydrogen sulfide toxicity in paddy fields, it is suitable to apply potassium chloride. Tobacco, sugarcane, potatoes, grapes, oranges and other crops are potassium-loving crops, but the tolerance to chlorine is weak, so potassium chloride should not be applied to avoid reducing product quality. The appropriate use of potassium chloride can improve the yield and lodging resistance of crops such as rice, wheat and corn, and has a very good effect on food crops with strong chlorine tolerance, such as rice, wheat, corn and so on. but it is not suitable for taboo crops such as tobacco, sugarcane, potato, tea, sugar beet and so on. Difference 3, potassium content: potassium sulfate generally contains 50% to 53% potassium, and does not contain chloride ion. Potassium chloride generally contains 60%-63% potassium and contains a lot of chloride ions. Fourth, the implementation standard: potassium sulfate implements the HG/T3279-1990 issued by the former Ministry of Chemical Industry. Potassium chloride implements the national standard GB6549-86. What is the function of zinc sulfate? what is the function of potash fertilizer?