Potassium is one of the necessary nutrients for fruit trees. It can promote the photosynthesis of fruit trees, promote the metabolism and synthesis of carbohydrates, promote the maturation of new shoots, and improve the ability of fruit trees to resist cold, drought, heat and disease. Potassium can also promote fruit enlargement, increase fruit sugar content, promote fruit coloring, and improve fruit quality. It is referred to by fruit farmers as "fruit fat." Potassium is the fruit nutrient element, quality element and stress resistance element. Therefore, applying potassium to fruit trees is an important cultivation measure that cannot be ignored. In fruit tree cultivation, the commonly used potassium fertilizers include potassium dihydrogen phosphate, potassium sulfate, and potassium chloride. In addition, the plant ash is also a good potash fertilizer.
Many years of practice have proved that the amount of potash used in Red Fuji apple should be higher than that of nitrogen, and the ratio of nitrogen, phosphorus, and potassium should be 1:0.6:1.5. After investigating the two-year-old Fuji branches, it was found that the partial drawing rate of nitrogen fertilizer was about 38%, while that of high potassium fertilizer was only about 4%, the drawing rate was significantly reduced, and both flowering and fruit setting rates were 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. The amount of potassium applied to red Fuji fruit trees can be calculated as about 1.8 kg of potassium fertilizer for 100 kg of fruit. For the first time 15 days before flowering, the application amount was 20% of the annual demand, the second time after the new shoot was stopped growing, 40% of the annual amount was applied, and the third time was 15 days before fruit coloring. , apply 40% of the annual demand.
Many years of practice have proved that the amount of potash used in Red Fuji apple should be higher than that of nitrogen, and the ratio of nitrogen, phosphorus, and potassium should be 1:0.6:1.5. After investigating the two-year-old Fuji branches, it was found that the partial drawing rate of nitrogen fertilizer was about 38%, while that of high potassium fertilizer was only about 4%, the drawing rate was significantly reduced, and both flowering and fruit setting rates were 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. The amount of potassium applied to red Fuji fruit trees can be calculated as about 1.8 kg of potassium fertilizer for 100 kg of fruit. For the first time 15 days before flowering, the application amount was 20% of the annual demand, the second time after the new shoot was stopped growing, 40% of the annual amount was applied, and the third time was 15 days before fruit coloring. , apply 40% of the annual demand.
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