When the fruit enters the rapid expansion period or is nearly mature, the signs of pest damage are often not seen, but there are a large number of fruit falling physiological drop phenomenon, resulting in reduced yields. The effective measures to reduce the physiological fruit drop of apples are described below:
First, thinning, thinning fruit. Too dense flowers will cause poor nutrition and metabolic disorders in the tree. In the period of fruit's rapid expansion or close to maturity, if nutrition fails to follow, it will cause a large amount of fruit to fall off. Therefore, scientific and rational flowering and fruit thinning are one of the effective measures to prevent fruit shedding.
Second, under the tree top dressing. According to the orchard's fertility foundation and tree nutrient status, nitrogen, phosphorus, and potassium fertilizers can be topdressed for fruit trees 20-30 days before the arrival of physiological fruit drop, and high-quality organic fertilizers can be applied to the fruit trees to prevent physiological fruit drop of the apple tree.
Third, foliar spray fertilizer. In order to quickly supplement the nutrients of the tree and reduce the degree of fruit drop, when the apple tree is close to the physiological fruit drop, it can continuously spray fertilizer 2-3 times, spraying 0.5% urea and 0.4% potassium dihydrogen phosphate solution.
Fourth, spraying plant growth regulators. Before the arrival of the apple tree physiological drop, spray 20-40ppm naphthaleneacetic acid solution every 10-15 days and spray it 2-3 times, which can effectively control physiological fruit drop. It is worth mentioning that this measure must be established on the basis of improving the nutrient of the tree, and the physiological fruit drop caused by other reasons is not obvious.
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