Potassium sulfate is a water-soluble powder used to supply potassium and sulfur. Potassium and sulfur are the most important elements needed by the plant. Potassium sulfate fertilizer has a lower Salinity co-efficient than other potassium fertilizers. Sufficient amount of potassium improves the color, size and quality of fruits and vegetables. Symptoms of potassium deficiency in older leaves include brown scorching of leaf tips and margins. Sulfur is involved in the structure of sulfur-containing amino acids, which are essential components of proteins. Lack of sulfur, like nitrogen deficiency, causes chlorosis of plant leaves.
