Navel orange seedlings must be well-prepared before planting large holes or troughs and underfoot plantar fat. After the planting seedlings survived, they mainly passed the following measures to promote the high yield in the third year. Reasonable pruning. Young trees must be cultivated in a tree shape, and they must not be tampered with. The methods of brushing, thinning, and shortening are generally used to promote multiple shoots. Specific methods of operation: In principle, in the first year of immobility, only the branches and branches are removed; in the second year, the seedlings are left with about 25 centimeters of trunk, and 3 to 4 evenly distributed main branches are cultured in the trunk above the trunk. Do two summer cuts, and the first time in mid-May, cut a short third of the old spring shoots on the outside of the canopy, promote robust summer shoots, and in the second time in mid-July, mature old trees outside the canopy. In the method of mildly picking up the hearts, in the middle of June, 6-8 leaves were picked up from the summer shoots, which lasted until mid-July. The lychee branches on the drooping branches were kept as far as possible. Branch trunk, the second year, flower buds should be timely eradicated, the third year to sparsely flower-based, sparsely leaves without flowers, malformed flowers, cut off sick branches, while taking some measures to protect the fruit. Yield per plant is generally controlled at about 5 kg to 8 kg, and excess fruit must be removed. Assisted management. After the seedlings are planted, they will be covered with rice straw to protect the seedlings. In winter, before the onset of the cold wave, you can use a large convenient bag to cover the seedlings or cover the branches with straw and brush the trunk with a whitening agent. Orchards promote intercropping legume crops or adopt orchard methods. The control of pests and diseases is basically the same as that of adult trees. In the third year, we must take appropriate measures to ensure fruit production and fruit production in the year.
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Scientific fertilization. The navel orange seedlings planted in the past can generally survive in half a month. After survival, they are required to topically apply one-time quick-release fertilizer every half-month, and use thin manure or 0.5% urea to apply water. It is also possible to apply urea to each plant under the tree after the rain. Ke, Shi Housong Pan, Eligan absorption. After August, it is not appropriate to apply fertilizer again to avoid late autumn shoots. In the second year, topdressing 3 times, reapply spring, summer, autumn shoot fertilizer. Spring fertilizer in early February, summer fertilizer in mid-May, autumn fertilizer in late July, respectively, 0.2 to 0.4 kg of urea per plant. After the autumn shoots are matured and then expanded, the basal fertilizers are re-applied. Each plant has 10 to 20 kg of fertilizer, 2 kg of superphosphate, and 1 kg of compound fertilizer. In the third year, the saplings began to increase phosphorus and potassium fertilizers and organic fertilizers to meet the needs of flower development. In early February, 0.4 kg of urea fertilizer was applied to each plant, and from the beginning of April until the beginning of August, one extra-root top dressing was performed every 20 days, mainly consisting of 0.2% potassium dihydrogen phosphate, 0.2% urea, 0.2% borax, and sulfuric acid. Zinc mixed solution or special fertilizer, in early July, Zhuang Shi Zhuang fruit fertilizer 2 pounds of compound fertilizer per plant, autumn topdressing also Yang Fei, and gradually cultivate and manage according to conventional adult tree fertilization methods. 
