Potassium is one of the essential nutrients for fruit trees. It can promote photosynthesis of fruit trees, promote the metabolism and synthesis of carbohydrates, promote the maturity of new shoots, and improve the ability of fruit trees to resist cold, drought, high temperature and disease. Potassium can also promote fruit enlargement, increase the sugar content of fruits, promote fruit coloration, and improve fruit quality, which is called “fruit fertilizer†by fruit farmers. Therefore, applying potassium to fruit trees is an important cultivation measure that cannot be ignored. For fruit cultivation, the commonly used potassium fertilizers are potassium dihydrogen phosphate, potassium sulfate, and potassium chloride. In addition, the plant ash is also a good potash.
Many years of practice have proved that the amount of potassium fertilizer in Red Fuji apple should be higher than that in nitrogen, and the ratio of nitrogen, phosphorus and potassium should be 1:0.6:1.5. After surveying the two-year-old Fuji branch, it was found that the rate of partial application of nitrogen fertilizer was about 38%, while that of high potassium fertilizer was only about 4%, the rate of extraction was significantly reduced, and the rate of flowering and fruit setting increased by more than 25%. The fruit can be colored 3 to 5 days in advance, and the fruit is large and uniform, which greatly reduces the incidence of rot disease.
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