What should I do if two centimeters of crape myrtle is fat? Leaves withered and curled.

Excessive fertilization's harm to trees and its preventive measures?

First, the harm of excessive fertilization to trees:

There are usually two reasons for fertilizer damage: one is improper fertilization method. When applying soil fertilizer or chemical fertilizer to soil, the fertilization area is too concentrated, or the fertilizer directly contacts the root system, causing root system burns. Spraying fertilizer on the leaves, the concentration of fertilizer solution is too high, or the spraying time is improper (such as spraying cloth at noon on hot days), which causes the leaves to be anxious and dry. Second, excessive fertilization made the root system suffer from light brown. With the fertilizer running in the tree, the taproot, trunk and branches may also be poisoned, and the bark may be dry and sunken, which may cause the death of large branches or the whole plant in serious cases.

B, preventive measures:

In order to prevent the occurrence of fertilizer damage, attention should be paid to avoid the above improper fertilization phenomenon when fertilizing. When fertilizing the soil, the manure should be evenly mixed and applied, and then irrigated in time. When using ammonia water, the water must be diluted (more than 30 times) and then poured into the fertilization ditch. It is necessary to select suitable fertilizer types, strictly control the concentration and avoid spraying at high temperature for topdressing outside the roots. If fertilizer damage occurs, the causes should be traced and corresponding remedial measures should be taken in time. Such as fertilizer damage caused by improper soil fertilization. Irrigation should be carried out immediately with a large amount of water to dilute the fertilizer concentration; If the root system has been seriously damaged, it is necessary to clean up the upper soil around the plant and sun the roots for a short time to promote the growth of new roots. If fertilizer damage occurs on the leaf surface, water should be sprayed on the leaf surface immediately, and spring rain 1 and Hai Jie Ling should be sprayed to reduce the fertilizer damage.