When the fruit enters the rapid expansion stage or near maturity, no signs of pests and diseases can be seen. However, a large number of fruits are often shed, resulting in reduced yields. Now, four measures of production are introduced to effectively reduce fruit drop. First, thinning and thinning fruit. Too dense flowers will cause poor nutrition and metabolic disorders in the tree. In the period of fruit's rapid expansion or near maturity, if nutrition fails to follow, it will lead to a large amount of fruit shedding. Therefore, scientific and rational thinning of fruit and fruit is one of the effective measures to prevent fruit shedding. Second, under the tree top dressing. According to the basis of orchard fertility and tree nutrients, 20-30 days before the arrival of physiological fruit drop, topdressing fruit trees nitrogen, phosphorus, potassium and other fertilizers. It is better to apply high-quality organic fertilizers for prevention. Third, foliar spray fertilizer. In order to quickly supplement the tree nutrition, reduce the degree of fruit drop, near the physiological fruit drop, can be sprayed for 2-3 times. In order to achieve the goal of improving fruit quality at the same time, spray 0.5% urea and 0.4% potassium dihydrogen phosphate solution. Fourth, spraying plant growth regulators. Before the arrival of physiological fruit drop, spray 20-40ppm of naphthalene acetic acid every 10-15 days and spray it continuously for 2-3 times, which can effectively control physiological fruit drop, but this measure must be based on improving the nutrition of the tree. It is only effective, and the physiological fruit drop caused by other reasons is not obvious.
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