How to improve the quality of longan fruit

Improving fruit quality is a comprehensive technical measure. First of all, it is necessary to strengthen the cultivation and management of the orchard, increase the application of strong fruit fertilizer, and do a good job in the prevention and control of diseases and insect pests in the fruit stage. The second strong fruit fertilizer can be applied to the fruit trees with more fruit at the beginning of June. Bran water (equivalent to 1kg dry bran) was applied to each tree with a crown of 5m (equivalent to 1kg of dry bran), or 1kg of compound fertilizer with a ratio of nitrogen, phosphorus and potassium at 15:15:15 plus 0.5kg urea. Trees with many fruits can also be fertilized once at the end of June and in the middle of July. In the aspect of disease and pest control, it is mainly necessary to do a good job in the control of litchi stem borer, sharp moth, litchi bugs and beetles. Secondly, it is necessary to do a good job in fruit thinning. Longan trees "cherish their young at the expense of their lives" and often hang too many fruits. Hanging too much fruit affects the quality of the fruit, the fruit is small and the soluble solids are low, so the plants with too much fruit must be thinned at the end of May and early June, and the moderate amount of fruit can give full play to the original characteristics of the variety. The third is to use some drugs during fruit development to promote fruit development and improve fruit quality. for example, the "nutritious high yield" prepared by Longan Room of Institute of Fruit trees, Provincial Academy of Agricultural Sciences, began to spray 10 days after flowering, spraying every 20 days or so, spraying 4 times in the whole fruit period, which can effectively improve the nutrition level of the tree, promote fruit development, improve fruit sugar content and fruit quality. According to the experiment in Yunxiao County, Fujian Province, compound triacontanol (TA) milk powder was sprayed 50 days before longan harvest (when longan seeds were about to turn black). Spraying once every 10 days for 3 times in a row could significantly improve the yield and quality of longan, with larger fruit, thicker pulp, stronger flavor and better appearance color. The fourth is to carry out ear bagging and fruit protection. After the second physiological fruit drop of longan in early June, ear bagging with 35 × 30 cm plastic yarn net bag can reduce fruit drop and fruit cracking, reduce the damage of fruit-eating pests and improve the appearance and color of fruit. Finally, providing sufficient water during fruit development and timely irrigation in case of drought, especially in the middle and later stages of fruit development, ensuring water supply can promote longan fruit development, increase fruit and increase yield.