Shatian pomelo small old tree transformation technology

“Little old tree” refers to the Shatian pomelo seedlings planted within 3-5 years of premature aging, becoming small and old aging trees, showing no production for many years, lack of plants, appearance is not good, the appearance of a fishing rod shaped like . This type of tree can be transformed into production and yield. 1. Deeply turning over and improving the soil and cultivating a strong root group “Beginning winter” to “Winter solstice”, dig the trenches around the tree tray year by year, requiring a ditch depth of 0.8-1 meter, a length of 1-1.5 meters, and a width of 0.6-0.8 meters. Deep application of green manure, pig cattle manure, chicken manure, pond mud, etc., to increase fertility, in order to facilitate the growth of the root group. Second, increase fertilization water, cultivate a strong spring and autumn shoots with the defecation of fecal water mainly with the right amount of chemical fertilizers, focusing on the spring and autumn tips of fertilization. When spring shoots and autumn shoots turn green, 0.5% urea, 0.2% trace fertilizer, and 0.3% potassium dihydrogen phosphate are sprayed outside the roots to promote shoots robust. In case of drought, water should be poured in a timely manner. Water should be drained in a timely manner in the rainy season and water should be properly controlled in winter. Third, timely prevention and control of pests and diseases in the clearing of the winter garden, spraying pesticides to eliminate overwintering pests, especially in the new shoots when there are long grains, timely spraying of 2000 times of kungfusin solution plus copper chloride 800 times liquid prevention and treatment Leafminers, Papilio and Peptic ulcers were sprayed once every 5 days. After shoots turning green, spray 20% broom-barrel net wettable powder 2500 times liquid to control red spider, and use 1.8% Chizilla pestle gem EC 5000 times liquid to prevent rust spiders. In late April to early May and late in July, spray 40% speed cull 800 times to control scale insects to protect the leaves. Fourth, reasonable pruning, cultivation of high yield canopy focus on winter pruning, cut off pests and branches, dead branches, cross branches. Too weak trees, based on the management of fertilizers and waters, can be cut short and heavy (retaining more vigorous shoots) to allow them to re-emerge the robust shoots so that the ratio of height to height of the trees is 1:1.2-1.5. Within range. Fifth, timely replant, do a good job of protection on the park too weak plants and lack of plants should be replanted as soon as possible, pay attention to do a good job of sun protection work, the larger branches with wax coated fracture and straw dressing. At the same time, 6-7 cm thick grass cover the ground in the canopy to protect the root group. Sixth, promote the strong fruit In the third year after the rejuvenation, take the technical measures to promote and protect the flowers. (1) Focus on the application of 5 times fertilization on fertilization, cultivar, fruit stabilization, tipping, and shoot growth in fertilization. Apply 0.5 kg of urea, 0.75 kg of compound fertilizer, and 0.75 kg of superphosphate throughout the year. 0.75 kg of potassium chloride and 250 kg of organic fertilizer with good quality. (2) Properly eliminate the excessively prosperous spring shoots, rationally remove buds, remove deformed fruit, disease and fruit. (3) Artificially assisted pollination was conducted, and Huaguoling was sprayed at the appropriate time to increase the fruit setting rate. (4) timely control of ulcer disease, scab disease, brown rot Phytophthora, leaf miner, Papilio, scale insects, red rust spiders, citrus pests and other pests. China Agricultural Network Editor