Cabbage is a kind of potassium-promoting crop, but for a long time, some vegetable farmers blindly pursued high yields and blindly increased the amount of nitrogen fertilizer without applying potassium fertilizer, which caused the quality of Chinese cabbage to decline, which affected its storage and commercial properties. 1. Effect of potassium application 1. Significant increase in yield. The test results showed that under the same conditions of nitrogen and phosphorus fertilizers, Chinese cabbage was increased with potassium fertilizer (50% potassium sulfate) 18 kg/mu, 2866 kg per mu higher than the control, and the yield rate was as high as 33.2%. The average yield of cabbage 159 kg per kg of potassium sulfate was increased. . 2. Improve disease resistance. The application of potash fertilizer can significantly increase the disease resistance of Chinese cabbage and reduce the incidence of disease. According to statistics, the incidence of disease caused by cabbage fertilizer application was only 1.9%, the incidence rate in the control area was 11.4%, and the incidence rate was reduced by 9.5%. 3. Improve the product rate of Chinese cabbage. The potash-causing Chinese cabbage was tightly packed, and there were few virtual leaves. The cabbage in the control area was not tight and the difference was obvious. In the winter storage, 3 tightly packed green leaves are used as the standard commercial vegetables. The rate of Chinese cabbage with potash fertilizer is 88.5%~91.2%, and that of the control area is 80%~83.1%. Potash fertilizer is used to increase the quality of cabbage products. Rate, thus improving economic efficiency. 4. Significantly improve quality. The experiment showed that the Chinese cabbage with K fertilizer increased the total amount of 7 kinds of amino acids by 31% compared with that of the control cabbage, increased the content of vitamin C by 4.2 mg/100 g, reduced the nitrate by 142 mg/kg, and enhanced the storage stability. 2. Potassium application method 1. Base application: Chinese cabbage should be produced for more than 10,000 kilograms, need 300 to 500 kilograms of refined organic fertilizer, 300 kilograms of dried chicken manure, and 3 manure of manure, and then apply compound fertilizer (nitrogen and phosphorus). Potassium content of more than 35%), such as Sacred-rich potassium sulfate compound fertilizer with 30? D40 kilograms; Nitrogen fertilizer (46% of urea, 15 kg), phosphate fertilizer (14% of calcium superphosphate, 30 kg), and potassium fertilizer (50% of potassium sulfate, 12 kg) were used as compound fertilizer without compound fertilizer. It is best to concentrate on ditching, ridge up with soil, and sow cabbage seeds on ridges. 2. Topdressing: Fertilizers in Chinese cabbage should account for more than 60% of the total amount of fertilizers in the whole growth period. In addition to topdressing nitrogen fertilizer (urea 20~25kg), another recovery of potassium sulfate 5~ 7 kilograms were applied between the ridges and ditched and watered. 3. Foliar spraying: 0.2% potassium dihydrogen phosphate can be sprayed from the rosette stage to the ball stage, spraying once every 7-10 days, spraying 3 times in total, in the morning, evening or cloudy day Sprayable.