Chongqing Dianjiang White Pomelo, also known as Huangsha White Pomelo, originated from Huangsha Township, Dianjiang County. It has a cultivation history of more than 170 years. It is a fruity, bright, juicy, tender, slag, sweet and sour, moderate quality. Excellent and famous throughout the country. In 1986 and 1989, they were successively awarded the titles of high-quality fruit of the province and the province. In 1995, they won the gold medal of the 2nd China Agricultural Fair. In 1998, they were awarded the title of Chongqing Famous Grapefruit. In 2001, they were awarded the titles of National and Chongqing Famous Brand Agricultural Products and were highly praised by consumers. Favor. The cultivation techniques are as follows: 1. The construction of orchards is convenient, with adequate water supply, deep soil, sandy soil and fertile soil in which the soil is fertile. The soil is less than 80 centimeters deep. It is necessary to blast and deepen the soil. Plantar fertilizer, large seedling colonization, 25 mu per plant, allocation of pollination trees such as Shatian pomelo. Second, soil management 1, deep turning ripening generally in September-October or the following year in March, taking sulcus-style, ring-style and blasting three ways to deepen the mature soil depth of 60-80 cm, deep-turning combined pressure burial Green manure, draft stalks, organic fertilizers and other organic fertilizer 5000 kg / mu. 2. The cultivator orchard orchard should cultivate 3-4 times a year to keep the orchard soil loose and without weeds, and the cultivator depth is about 20 cm. 3. It is forbidden to grow corn, wheat and other high-vine vine crops in intercropping orchards, promote the cultivation of legumes, peanuts, sea cucumbers and other vegetable crops, and cut down the bamboo and miscellaneous trees in the garden. Third, fertilizer and water management pad Jiangbaiyou belongs to tall evergreen trees, the tree is deeply rooted, and it needs large amount of water for fertilizers. The farmers call it "rich tree", must be big and big fertilizer, organic fertilizer added, and chemical fertilizer applied rationally. 1. Sapling fertilization 4-6 times a year, focusing on fertilizing at the time of the new shoots, especially during the 2nd to 3rd month of spring shoots, 7~8 months to promote the autumn shoots, 25 - 50 kg, 0.5 kg of urea (or 1-1.5 kg of ammonium hydroxide). The method of fertilization is to dig ring grooves and strip grooves. 2. Fertilization of result trees Fertilizers should be applied four times a year. Radial grooves and strip grooves are used for fertilization. (1) Flowering fertilizers, generally from late February to early March, are mainly quick-acting chemical fertilizers and are used in combination with human and animal wastes. Fertilizer amount: 100-150 kilograms of human/animal manure/plant, 1.0-2.5 kilograms of urea/strain (or 2.5-7.5 kilograms of ammonium hydrogenate/strain), and 1-2 kilograms of superphosphate, accounting for about 30% of the annual total. (2) Steady fruit fertilizer: After 5-6 months of flowering, more foliar fertilizer is used. 0.3% KH2PO4+0.3% urea can be sprayed once every 7 days for 2-3 times, accounting for the whole year. About 5%. (3) Strong fruit fertilizer: In early July-August, quick-acting phosphorus and potassium fertilizers are used together with organic fertilizers, and the amount of artificial fertilizers is 100-150 kg/plant of livestock manure, 2.0-3.0 kg of superphosphate/strain, and 1.5-2.5 kg of potassium fertilizer/ The plant accounts for about 40% of the entire year. (4) Post-harvest fertilizer: From late October to early December, organic manure, manure and livestock manure, oil cake and other organic fertilizers are mainly used. Fertilizer amount: 100-150 kilograms of human and animal manure, 2.5-5.0 kilograms of oil cake, Soil miscellaneous 50-100 kg, accounting for about 25% of the year. Fourth, pest control should focus on prevention and control of "three diseases, three insects." 1, foot rot, gum disease requirements in the early stages of the disease, and control Tianniu. Use a knife to scrape the dead and dead parts (rot and plastic parts) and draw a small “#†character. Coat the diseased part 100 times with 65% dexamethasone 2-3 times, 7-10 days apart (after scraping Coat) and pay attention to replacing the soil with disease-free soil). 2. Anthracnose is controlled 2-3 times with 65% of dexamethasone 400-500 times or thiophanate-methyl 800 times in the initial stage of disease. 3. Red and Yellow Spiders: It takes about 18-20 generations a year in Dianjiang River, and it is heavy in spring from March to June and from June to September in autumn. It should be used in early March or late May with 5% Nissoline 1500. - 2000 times, 41% of Jinbazhi 1500-2000 times, 20% of fast ketones 3000-5000 times (optional one) control 2 times, interval 7-10 days. 2. Jian Jian: In Dianjiang, there are 3 generations a year, and in the first half of May, the middle of July and the end of September, the first-instar nymph is the best prevention and control period. The control agent is 40% culling 2000-3000 times. 40% Lexane 1000-1500 times, 95% oil emulsion 100 times, etc. (optional one) control 2-3 times, interval 7-10 days. Fifth, plastic pruning 1, shaping: saplings take support, pull, hanging sticks, combined with dense and weak branches, standing erect long branches and other methods; adult trees to open the "skylight" method. 2, pruning: Take a large branch pruning, dense and weak branch of the extensive pruning method, trim when the upper part of the weight, the lower part of the light, four-way weight, the internal hemorrhoids should be protected within the internal hemorrhoids and the lower leaves without the result of branches, at the same time, cut off the pests Branches, dry branches, cross branches, leggy branches and so on. Sixth, to promote flower and fruit protection 1, to promote the use of organic fertilizer, prevention and treatment of diseases and insect pests, pull branches shaping as comprehensive measures to promote the early flowering white pomelo, early results. 2. The first use of fruit cross-pollination is to increase the fruit setting rate and increase the yield guarantee quality. The second is to plant (or change) the pollination tree at a ratio of 10:1, or to change the height of each tree. 2 pollination branches, pollination varieties optional shatian pomelo, xixi pomelo, Liangshan pomelo, Xujia white pomelo and other good grapefruit, must not choose sour grapefruit, red heart grapefruit and other miscellaneous pomelo; third is after Xiehua, the first time The second physiological fruit drop period was 0.3% ammonium phosphate dihydrogen phosphate + 0.3% urea, each sprayed 1-2 times, 7-10 days apart. 3, to improve quality First, pre-harvest water control, improve sugar; second is to eliminate malignant early mining, promote fruit picking.