There is a lot of rain and a lot of orange fruit is falling. What should I do? The diameter of the orange is already 1.5 centimeters

Oranges suffer from abnormal physiological fruit drop. Increased rainy weather is a factor. In addition, during the stages of young fruit development and fruit enlargement, fruit trees are heavily fertilized. After increased rainfall, the absorption and utilization rate of nitrogen by the roots increases. There are many shoots in summer, and the new shoots and fruits compete for nutrients, which will also aggravate the problem of fruit drop. To prevent and reduce the problem of abnormal fruit drop, it is necessary to control the use of nitrogen fertilizers. At the same time during the development and expansion stages of young fruits, pay attention to the supplement of phosphorus, potassium and calcium, and spray Micro-Fruit + Bili multiple times to reduce fruit drop.