First, post-planting management Careful post-planting management can greatly improve the survival rate of planting. 1, timely watering: once a week if the weather is fine within one month after planting. 2. Pay attention to drainage: drain water in time after rain to prevent stains and root rot. 3. Tree tray mulching: cover the tree tray with straw or spray new high-fat film to reduce evaporation and stabilize soil temperature. Second, soil, fertilizer and water management 1, soil management: soil is the foundation for the growth of fruit trees, and navel oranges grow well in loam with deep soil layer and PH value of 5.5-6.5. One month after planting, shallow intertillage fertilization was carried out in the whole garden, and then intertillage fertilization was intercropped for 2-3 times. 2. Timely fertilization: The main purpose of the second year after planting is to promote the growth and development of young trees, extract strong branches and make them take shape quickly. Fertilization is mainly based on nitrogen fertilizer, with phosphorus and potassium fertilizer. 3. Reasonable irrigation: timely ditch drainage in spring and summer rainy season to prevent waterlogging, timely irrigation in autumn and winter drought to prevent drought and frost. 3. Trim and select 3-4 main branches in different directions at the height of 30cm, and remove the rest. Take methods such as bracing to form a natural happy tree, and expand the crown as soon as possible by removing zero and leaving all, removing early and leaving all, unifying branches and cutting short and long skills. After pruning, stick an antiseptic film to promote wound healing. Four, in order to prevent fruit cracking caused by fruit cracking in dry season, irrigation and tree mulching should be carried out in time, and the thickness of grass mulching is 10 ~ 15 cm. Before plastic film mulching, shallow tillage should be carried out around the tree tray, and a new high-fat film should be sprayed on the soil surface to prevent excessive evaporation of water. Spray melon and fruit Zhuangdiling once before flowering, at the young fruit stage and at the fruit expansion stage, so as to improve the fruit expansion vitality, self-adjust the nutrition collocation, and protect flowers, fruits, strengthen fruits, increase color, and prevent fruit from falling and cracking. From June to August, especially in the first half of July, apply potassium fertilizer 1 ~ 2 times. Spraying a new high-fat film on the fruit surface can prevent the fruit from falling off and cracking, and prevent the infection of pests and diseases. V. Main Pests and Their Control The main pest is red spider, and the main disease is canker. Prevention and control methods Spraying is aimed at the prevention and control of new drugs and new high-fat films. Six, cold protection and garden cleaning, water spraying, soil cultivation, grass mulching, plastic film mulching and smoking, trunk spraying "universal tree protection" emulsion to keep warm and prevent freezing, and protect trees from wintering safely. Secondly, cut off diseased branches, remove deciduous weeds, burn or bury them deeply, and then spray the whole garden with "general tree protection" to kill the virus and seal the garden.