Huang Bei prefers fertile, loose, deep and well-drained soil layers, and avoids areas with stagnant water, drought, high dryness and sticky soil as orchards. The focus of soil management is fertilization. Fertilization of wampee bearing trees should be coordinated with nitrogen, phosphorus, potassium and magnesium three times a year. The first time is to promote flower fertilizer (applied before and after severe cold), with the aim of promoting flower bud differentiation and good flowering and fruiting. It is necessary to combine the late-acting fertilizer with the quick-acting fertilizer. The ratio of N, P and K is 1.0: 0.5: 0.8, and the amount of fertilizer applied accounts for about 25% of the whole year. The second time is to strengthen fruit and promote summer shoot fertilization (before fruit thinning), with the purpose of strengthening fruit and promoting summer shoot, mainly potassium and nitrogen, combined with phosphorus and magnesium, and the fertilization amount accounts for about 30% of the whole year. The third time is to promote autumn shoot fertilizer (applied after fruit picking), the purpose is to quickly restore tree vigor and promote the development of autumn shoots with good quality and quantity to become fruiting branches. This time, chemical fertilizer is the most important primary fertilizer, accounting for 45% of the whole year. It is best to apply organic fertilizer such as human and animal manure, nitrogen, phosphorus and potassium fertilizer, and the proportion of nitrogen should be appropriately increased.

Old leaves with yellow skin often have obvious symptoms of magnesium deficiency, so attention should be paid to magnesium application. In addition to calcium magnesium phosphate fertilizer, depending on the crown size and symptoms, 25 ~ 75g magnesium sulfate was applied to spring shoot fertilizer and autumn shoot fertilizer respectively. Combined with pest control, 0.3% magnesium sulfate was sprayed outside the roots.

Huangpi likes soil mixed fertilizer, which can increase nutrients, enrich soil, keep moisture, inhibit weeds and loosen soil. Soil miscellaneous fertilizer and organic fertilizer 1 should be applied frequently, and dead branches, diseased branches, shady branches and dense weak branches should be pruned before flowering in spring to ensure ventilation and light transmission. After fruit picking, the fruiting branches should be shortened in time to promote the germination of autumn shoots, and the weak branches should be thinned from the base. Generally, a few strong buds should be left at the base and then cut short. After fruit picking, the fruit trees should be pruned comprehensively, which is conducive to promoting orderly germination. Cutting short the fruiting mother branch, cutting off the ear at the top of the fruiting branch, and removing dead branches, disease and insect branches and weak branches; Reasonably shape the tree body, such as coping with the skylight, recovering the long pruned branches, and deleting the over-dense branches to form a good round-headed tree. About 10 days after plastic pruning, that is, around beginning of autumn, branches began to sprout autumn shoots, especially the cut branches sprouted more. Choosing the top two buds and smoothing all the others is beneficial to concentrate nutrients and produce strong branches. Because the top of Huangpi autumn shoots has a strong growth advantage, according to the practice of fruit farmers, timely coring autumn shoots to break the top advantage can promote the second late autumn shoots and increase the total amount of autumn shoots; At the same time, by coring, the branches can be shortened and compact, the crown can be dwarfed, and more flowers and fruits can be promoted. The specific method of coring is: after picking the yellow peel, leave 2-3 compound leaves on the fruiting branches for short cutting, so as to promote the advance of autumn shoots, without affecting the unfruitful branches of the tree, and let them naturally grow autumn shoots. When the second autumn shoot grows 6-8 compound leaves, the length is 13- 15 cm, and the base stem is as thick as a chopstick head, the core is removed. Leave 5-6 compound leaves, pick them early and stay short, and pick them late and stay long. According to the emergence time and growth speed of the first batch of autumn shoots, coring can be carried out in batches, but not later than the end of September at the latest. The peeling of wampee must be combined with fertilization in order to extract the second autumn shoot in a short time. The first time it was applied immediately after the fruit was picked, and the second time it was applied after the first batch of autumn shoots were picked. Fertilize ...