The young trees of Nanfeng tangerine often adopt natural round-headed tree shape, which is characterized by low trunk and easy to branch from the base into several thick branches with the same size as the skeleton. It is easy to reshape and trim, but there are many main branches, the affiliation is unclear, the crown is easy to close, the leaf curtain is thin, and the surface is easy to sprout. During plastic surgery, there are three main branches on the trunk, and each main branch is mainly composed of two auxiliary main branches, plus three extension branches and nine skeleton branches of the main branch. Generally, after three years, the prototype of the dental crown can be formed. Prune the first fruit tree. Nanfeng tangerine began to bear fruit in 3-4 years. At this time, the plant should not only expand its crown, but also increase its yield year by year. Pruning should continue to deal with extended branches, with side branches, mainly with light pruning, and try to keep the branches and leaves green. Remove the upright branches and pest branches from the main branches. In order to avoid the contradiction between bamboo shoots and fruits, pay attention to putting summer bamboo shoots and autumn bamboo shoots. For leafy plants, it is necessary to remove some strong branches, try to keep weak spring buds, support branches, hang branches and fruit, and pay attention to retraction after results.

Pruning of adult fruit trees generally enters the full fruit stage around 10, and obviously declines after 40 years. Nanfeng tangerine, which has been more than 20 years old, has many buds, neat hair and full growth in spring. There are few summer buds, but they are also full. The number of autumn shoots is only the second spring shoots, and the tissue is loose and diamond-shaped. In late autumn, the blade tip is short and flat, and the leaves don't turn green in time, which is useless. The secondary branches in spring and summer and the secondary branches in spring and autumn are the best fruiting mother branches, and the strong primary branches can also be fruiting mother branches. Young branches and new branches extracted from old branches or fallen-flower branches over 3 years old account for a certain proportion, although the effective fruit-setting rate is low, so it is not suitable for thinning all these branches, but they can be thinned after fruiting. A certain number of fruiting mother branches can be formed in the second year. Fertilization management The quality of Nanfeng tangerine is closely related to fertilization, and the application of organic fertilizer can achieve high yield and high quality. The application of chemical fertilizer and partial or large amount of nitrogen fertilizer obviously reduces the quality, reduces the taste, increases the floating fruit and aggravates the diseases and insect pests.

In the first 3~4 years after fertilization and planting, young trees mainly promote the growth of trees and grow into better tree frames as soon as possible. It is advisable to apply quick-acting fertilizer or nitrogen fertilizer 5-6 times a year. During the germination of new buds and the turning of new leaves, 300-400g of urea, 400-500g of ternary compound fertilizer or 2-3kg of water-rotting fertilizer are applied to each border or hole. It is best to apply urea once and manure decomposed by water next time, which can enrich branches, make leaves strong and green, and improve the stress resistance of young trees. Fertilize adult trees with winter fertilizer. It should be applied before and after fruit picking, and then an appropriate amount of organic fertilizer should be applied from early June165438+mid-February 65438. The soil improvement garden can be combined with fertilization, with each plant burying 40-50kg of decomposed pig manure or 6 6- 10/0kg of decomposed chicken manure, 2-3kg of cake fertilizer and calcium magnesium phosphate fertilizer 1 kg. Spring fat. When spring buds germinate or just germinate, each plant should be applied with 1~ 1.5 kg ternary compound fertilizer or 50 kg water rot fertilizer.

Apply 1 kg ternary compound fertilizer or 40-50 kg decomposed water and fertilizer to each plant in the ditch. Expanded fruit fertilizer. From the end of June to the beginning of July, furrow application or hole application, with 1.5 ~ 2kg of ternary compound fertilizer,1.5kg of cooked soybean or 60 ~ 70kg of water-rotted fertilizer applied to each plant. Soil improvement should be carried out continuously for 2~3 years in plots lacking organic matter such as red yellow soil and shallow mature soil layer, and then every 4~5 years as appropriate. Soil improvement is carried out on one or both sides of the tree every year, young trees are connected with planting ditches (holes), ditches are dug and fertilizers are buried every year to improve the soil until the whole orchard. The trench is 1 ~ 1.2m wide and 0.6 ~ 0.8m deep. 40-50 kg of soil miscellaneous fertilizer, 0/5-20 kg of straw, 30-40 kg of decomposed pig manure, 0/0 kg of cake fertilizer and 0.5 kg of calcium superphosphate are buried in layers per meter ditch. Minimize the damage to the root system when ditching. The sooner the fertilizer is buried, the better. Should not be dragged for a long time, so as not to dry the bare roots. All excavated soil should be restored to its original state to avoid potholes after sinking.