1. Fertilization time. Winter fertilization should be done as soon as possible, preferably in mid-November, and at the latest in early December, should be sooner rather than later.

2. The amount of fertilization. The application rate of winter fertilizer is determined by different fertilizer types. The fertilizer should be mainly nitrogen, phosphorus and potassium compound fertilizer. The amount of fertilization should be applied by weak trees, and the trees and old trees should be applied more. The trees and small trees should be reduced appropriately. In principle, the application amount of chemical fertilizers accounts for 5-10% of the annual application rate, and the organic fertilizer contains 2500-3000 kg of straw slag grass or 100-150 kg of cake fertilizer or 300 kg of decomposed chicken fat.

3. Application method. The fertilization method is related to the type of fertilizer. The type of fertilization depends on the type of fertilization. The slag grass should be pumped 60 cm deep and 40 cm wide. The cast fertilizer or chicken manure can be excavated with an annular groove of 3030 cm. It is best not to choose high-content and fast-dissolving fertilizers. For example, when applying high-content and fast-dissolving fertilizers, it is necessary to fill the water. In combination with fertilization, the tree guards should be applied to protect the trees in the trunk, disinfecting and frost-proof, and blocking the wintering virus. The tree is multiplied; and the generals in the whole park are sterilized and disinfected to reduce the source of the bacteria.

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