Production Routes, Product Grades, and Fertilizer Selection Potassium is one of the three primary macronutrients required by plants. It plays an essential role in carbohydrate synthesis and transport, water regulation, enzyme activation, stress tolerance, crop quality, and yield formation. Potassium chloride, commonly known as muriate of potash or MOP, and potassium sulfate, commonly known as sulfate of potash or SOP, are two of the most widely used potassium fertilizers. Alt