How to manage Shatian pomelo before flowering?

How to manage Shatian pomelo before flowering? Also ask the netizens who know to help introduce that Shatian pomelo should do a good job in fertilizer and water management and pest control before flowering, in order to promote strong tree momentum, improve tree nutrition level, promote strong flower buds, improve flower bud resistance, reduce diseases and insect pests, protect flower buds, and improve fruit setting rate. Shatian pomelo fertilization and pest control before flowering are sorted out by the planting network, which are listed below for netizens' reference. First, fertilization before flowering of Shatian pomelo: apply pre-flowering fertilizer before the emergence of flower buds, mainly organic fertilizer and phosphorus and potassium fertilizer, fruit trees of more than five years old, each tree applying 0.5 kilograms of potassium dihydrogen phosphate and 15 kilograms of rotten human and animal manure, dig a ring ditch with a depth of 15 centimeters and a width of 30 centimeters around the crown dripping line, fully stir the fertilizer evenly, apply it in the ditch, and cover the soil. In case of dry weather after fertilization, clear water or retting rotten manure should be applied in time, 50-60 kg per plant, in order to promote the dissolution and transformation of fertilizer. 2. Pest control before flowering of Shatian pomelo: before flowering, Shatian pomelo focuses on controlling diseases and pests such as red spider, anthracnose, scale insect, canker, flower bud maggot, etc., when the bud is just white, when the bud is big and when the bud is about to open. In order to protect the flower buds, the mixture of 800x grey frost, 3000 times Caozaojing, 1500 times thiophanate methyl, 800times dicofol and 1000 times speed were sprayed once to protect the flower buds. 3. Foliar topdressing of Shatian pomelo: combined with pest control, the mixture of 1000 times active element, 5000 times natural brassin and 300 times potassium dihydrogen phosphate is sprayed together, which can not only strengthen the effect of disease prevention and control, but also promote strong flower buds. Improve the ability of flower buds to resist low temperature and rainy weather in spring. Planting techniques of grapefruit efficacy and function of grapefruit