In order to prevent the loss of a large number of fruit from the apple tree and reduce the yield, the following three methods can be used:
One is top dressing under the tree. According to the orchard's fertility foundation and tree nutrient status, nitrogen, phosphorus, and potassium fertilizers can be applied to fruit trees 20-30 days before the arrival of fruit drop, and high-quality organic fertilizers can be applied to fruit trees to prevent fruit trees from falling.
The second is foliar spray fertilizer. In order to quickly supplement the nutrients of the tree and reduce the fruit drop rate, when the apple tree is close to the physiological fruit drop, it can continuously spray fertilizer 2-3 times and spray 0.5% urea water and 0.4% potassium dihydrogen phosphate solution.
The third is spraying plant growth regulators. Before the fruiting of the apple tree, spray 20-40 mg/L Naphthylacetate solution every 10-15 days and spray 2-3 times, which can effectively control physiological fruit drop. It is worth noting that this measure must be established on the basis of improving the nutrient of the tree, and the effect of physiological drop on other causes is not obvious.
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