With the development of the chemical fertilizer industry, the number of chemical fertilizers is also increasing. Potassium sulfate compound fertilizer is a new type of fertilizer developed rapidly in recent years. Because it is flexible and convenient to use, full of nutrients, and high utilization rate, it is favored by many vegetable farmers, but the application methods and methods should be paid attention to when using it. 1. Do base fertilizer. The potassium sulfate compound fertilizer has a full nutrient content and a wide range of application. In application, it is generally not necessary to apply other chemical fertilizers. Because of the different concentrations, the application amount is also different (the fertilizer concentration is 25%, 30%, 45%, etc.). For example, when a compound fertilizer with a concentration of 45% is used as the base fertilizer, it is applied to 40-mu per acre. 75 kg and apply a certain amount of decomposed organic fertilizer. 2. Do top dressing. The proportion of general-purpose potassium sulfate compound fertilizer that is relatively common in the agricultural capital market is nitrogen, phosphorus and potassium (15-15-15). For vegetables that require more nitrogen, nitrogen fertilizer (such as urea) should be used. Special fertilizers for vegetables may also be used, and the principle of multiple fertilization should be mastered. 3. Foliar spraying. From the point of view of production practice, vegetable growers are less widely used. When vegetables suffer from a severe synthesis deficiency disease, they can spray potassium sulfate compound fertilizers, such as 45% compound fertilizer, at a concentration of 0.1% to 0.3%. It will be fine.