Cause of fruit drop: lack of nutrition. The tree vigor is too weak, or consumes too much nutrients, and the fruit is shed due to hunger. In rainy weather, the root system is prone to oxygen deficiency; pests and diseases occur.
Reasons for cracking: Shady orchards have more fruit cracks; moisture is too dry and wet to change; old trees result in delicate shoots; trace elements such as calcium, magnesium, boron and zinc lack susceptibility to cracking; nitrogen and potassium are also used in excess.
Prevention: Before the rapid expansion of pulp, the fruit coloring period, before the fruit collection, were sprayed with 30 ml of water and 15 kg each of Yuhualing No. 2 and Yuhualing No. 1 respectively, spraying 3 to 5 times successively. Spraying UF can timely supplement various nutrients necessary for fruit growth and development, enhance disease resistance, reduce fruit drop, promote fruit enlargement and early maturation. At the same time, it can promote the development of pericarp, make the pericarp hard and tough, and have permeability, so as to reduce fruit cracking at the later stage of fruit development.
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