How to fertilize honey pomelo scientifically?

How to fertilize honey pomelo scientifically? Please introduce in detail the method of honey pomelo grown in Hubei, Chongqing, Hunan, Guangdong and other places in China. Honey pomelo tastes sweet and sour, slightly bitter, rich in vitamin C and a large number of other signature nutrients. It is recognized by the medical community as the most effective fruit for dietotherapy. Therefore, the planting network has sorted out the fertilization methods of honey pomelo, which are listed below for netizens' reference: more than 90% of honey pomelo base fertilizer is planted in hilly and mountainous areas. therefore, the vast majority of orchard soil is red soil, the acidity of red soil is high, the PH value is between 4.5 and 5.5, the acidity of orchard soil is strong, and the content of organic matter is low. Therefore, before and after the Beginning of Winter to Lesser Snow (November), combined with soil improvement and hole expansion, re-application of fruit-picking fertilizer, in order to restore tree potential as soon as possible, promote flower bud differentiation and accumulate nutrients for the fruit of the second year. When expanding the hole, each plant applies 15 jin of bio-organic fertilizer, 0.5 jin of phosphate fertilizer and an appropriate amount of nitrogen fertilizer. According to the actual growth of the tree, 0.5% potassium dihydrogen phosphate can be used as external topdressing fertilizer and 0.2% boric acid can be sprayed once to facilitate flower bud differentiation. Second, honey pomelo strong shoot fertilizer: honey pomelo strong shoot fertilizer is applied once from February to March, each plant is 0.5 kg of urea and phosphate fertilizer and 1 kg of borax. After spring shoot germination, 0.5% potassium dihydrogen phosphate and 0.3% urea can be used for extra-root topdressing (spraying) to promote robust shoots and flowers. 0.3% urea and 0.5% potassium dihydrogen phosphate can be used for external topdressing in early and middle March, respectively. Third, honey pomelo stable fruit fertilizer: fertilizer can be applied according to the growth situation of honey pomelo from April to May. Compound fertilizer is applied to each plant by 1.5 jin respectively. After mid-April, 0.5% potassium dihydrogen phosphate is applied outside the root. After flowering, 5ppm 2mine 4% magnesium sulfate and 300ppm anti-falling element are sprayed respectively. In case of dry weather, fruit trees should be irrigated in time to prevent fruit cracking of pomelo. Fourth, the strong fruit fertilizer of honey pomelo: the fruit of honey pomelo expands rapidly from July to August, and the fertilization should be based on organic fertilizer and available fertilizer. Each plant was fertilized with bio-organic fertilizer 2m / kg, compound fertilizer 0.6 / kg, and urea with half a jin per plant. According to the tree potential, the amount of fruit should be increased as appropriate. When fertilizing, the method of open trench is generally used, with the crown dripping line as the midpoint, the ditch length is 0.5 meters, the depth and width are 0.15 meters, and there are 10 ditches per plant, and the soil is covered after fertilization, and the position should be changed every time. Planting techniques of grapefruit efficacy and function of grapefruit