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Potassium sulfate (K2SO4), often known as SOP, is gaining popularity as a substitute for potassium chloride-based fertilizers. It’s an ideal choice for crops that are sensitive to chloride or for soils that have accumulated too much of it. SOP is also beneficial for crops requiring sulfur and for use in soils with high salinity. Unlike some fertilizers, potassium sulfate isn’t typically found in nature and is commonly produced using the Mannheim process.