(1) Fertilization principles: The needs of blood oranges for various nutritional elements should be fully met. It is recommended to apply more organic fertilizers and rationally use inorganic fertilizers and formula fertilizers. Fertilization is guided based on leaf analysis results, orchard soil analysis results, blood orange phenological stages, etc. (2) Fertilization method: Mainly soil fertilization, combined with foliar fertilization. Methods such as circular furrow application, strip furrow application, hole application and soil surface spreading of fertilizers are used. (3) Fertilizer for young trees: Apply frequently and lightly, mainly nitrogen fertilizer, combined with phosphorus and potassium fertilizers, fertilize 5-6 times in spring, summer and autumn during the shoot growth period, (3, 5, 6, 7, 9, 12 Monthly, apply 0.4 catties of ammonium bicarbonate or 0.2 catties of urea per plant each time. Apply 100-400g of pure nitrogen to a single plant of 1-3 year old trees. The ratio of nitrogen, phosphorus and potassium is 1.0: (0.4-0.5): 1.0. . Fertilize the adult tree four times, namely sprout fertilizer, fruit-preserving fertilizer, fruit-strengthening fertilizer, and fruit-picking fertilizer. The amount of fertilizer is generally 2-3 pounds of chemical fertilizer for germination and one load of manure; 1-2 pounds of phosphorus and potassium fertilizer for fruit-preserving fertilizer. 1 kilogram of chemical fertilizer; 1-2 kilograms of chemical fertilizer + 1-2 kilograms of phosphorus and potassium fertilizer for fruit growth; mainly organic fertilizer for fruit picking (base fertilizer), 50-100 kilograms of organic fertilizer + 1-2 kilograms of chemical fertilizer (4). Moisture: Irrigate when the soil is dry and drain when there is water. Shaping and pruning 1. Principles. Prune appropriately according to local conditions, promote ventilation and light transmission, and achieve three-dimensional results. The main branches (3-4 branches) are scattered and scattered on the main trunk. The branch angle of the main rod is 30°-50°. There are 2-3 secondary main branches on each main branch. Generally, after the third main branch is formed, it will grow. Cut off the central stem and twist it to one side to make the fruiting branch group. (1) Pruning of young trees: Mainly, select the extension branches in the center of the cluster and the extension branches of the sub-main branches. Severely or even severely shorted, and the degree of shorting and the direction of the cutting buds are used to adjust the growth balance between the main branches. In addition to appropriately thinning out the overly dense branch groups, the inner branches and the weaker branch tips in the middle and lower part of the crown are adjusted. Generally, they should be retained. (2) During the initial fruiting period: continue to choose short-cut extension branches at all levels to wipe out summer shoots and promote strong autumn shoots. In autumn, use measures to promote flowering such as girdling, root cutting, and water control. (3) During the fruiting period: timely retract the fruiting branch group, the flowering and declining branch group, and cut off light-blocking branches, dead branches, and diseased and insect-infested branches.