The application of potassium sulfate should be tailored to the specific needs of the crop and the existing soil nutrient levels, which can be determined through soil testing. The usual application rates vary depending on the crop type, soil conditions, and growth stage. For many crops, incorporating SOP into the soil before planting or as a side-dressing during the growing season can optimize its benefits.
One of the most common applications of sodium metabisulfite is as a food preservative. It is widely used in the food and beverage industry to prevent spoilage and oxidation, particularly in dried fruits, wines, and certain types of juices. By inhibiting the growth of bacteria, yeast, and molds, sodium metabisulfite helps extend the shelf life of these products. Moreover, it prevents browning reactions in fruits and vegetables, maintaining their appealing appearance. The FDA has recognized sodium metabisulfite as safe for use in limited quantities, although it can cause allergic reactions in some individuals, particularly those with asthma.