Yuhuan Wendan Name Yuhuan Wendan Origin Zhejiang Taizhou Yuhuan alias Yuhuan pomelo season in beginning of autumn is characterized by crisp and tender meat, rich residue juice, strong and fragrant taste, sweet and sour taste and good quality. Ingredients are rich in sugars, organic acids, vitamins A, B, C, and various trace elements and amino acids. Efficacy Regular consumption of Yuhuan pomelo can regulate qi, eliminate phlegm, moisten spleen and clear intestines, reduce pathogenic factors and relieve alcoholism, and has a good curative effect on diseases such as hypertension, diabetes, anorexia and dyspepsia. Limonin extracted from fruits has the function of preventing and treating cancer. Long-term indoor fragrance can drive away cockroaches. The essential oil rich in peel can be used as a protective agent to prevent mosquito bites. Peel can remove the odor of refrigerator. High-quality essential oil can be extracted from epidermis and flower leaves, high-quality pectin can be extracted from fruit cortex, and pulp can be processed into fashionable drinks such as juice and milk. Yuhuan Wendan belongs to Rutaceae and Citrus and is one of the excellent varieties of Zhejiang pomelo. The fruit is oblate and oblate, the peel is yellow to orange, smooth, the oil cells are fine and fragrant, and the flesh is yellow or honey yellow. It is mainly distributed in the coastal soil and foothills of Chumen, Yucheng and Chenyu in Yuhuan County, with a cultivation area of about 2,000 hectares and an annual output of 1.700 tons. Wendan has high processing value, and the processed series products have unique advantages and high processing added value. The pulp can be processed into a series of drinks such as pure natural granular juice and raw juice, without any spoilage, and the peel can extract limonin and pectin or make preserved fruit and jam. Breeding conditions of improved varieties Yuhuan belongs to subtropical maritime monsoon climate, which is mild and humid, with abundant sunshine and distinct seasons. The annual average temperature is 17℃, the frost-free period is 327 days, and the annual precipitation is 1400 ~ 1500mm, which is evenly distributed. There are low mountains and hills on the peninsula. The soil is yellow (red) acidic sandy soil. Yuhuan pomelo is mainly distributed in Chumen Town, Qinggang Town and Longyan, Mixi, Du Fang, Tongli and other towns on the peninsula, which has become the breeding base of Yuhuan pomelo in this province. The experiment of suitable rootstock for Tu Hai Chumen Wendan was conducted on 1988 in Wendan Garden, Chumen Chubeitang, Yuhuan County. This garden was reclaimed in the 1970s. The soil pH is 8.3 ~ 8.5, and the tested trees are 7-year-old Wendan and Tutuo rootstocks. In addition, other coastal pomelo orchards were investigated. The investigation items include the effects of different rootstocks on aboveground growth and fruiting of plants, root distribution, phenology and flowering and fruiting habits. From the investigation results, it can be seen that the grafting affinity between Chumen Wendan and Tuyuan is strong, and the lower part of the grafting interface is swollen. Fast growth, vigorous tree growth, 3 ~ 4 years after planting began to bear fruit. The crown is tall, which can adapt to all kinds of soil, especially salt and alkali tolerance, and has good high yield performance. However, as the rootstock of flat fruit Wendan, the fruit cracking is more serious in the mature stage. The grafting affinity between Chumen Wendan and Chongqing Orange is strong, and the connection between rootstock and panicle is symmetrical. The crown is short and compact, with vigorous growth and high yield. Small fruit shape, tender juice cells and light fruit cracking. The grafting affinity between Chumen Wendan and Fructus Aurantii is strong, and the grafting part is small and large, with a spiral line. The tree has a strong growth potential and a tall and dense tree shape, and is suitable for being used as a mountain Wendan rootstock. When cultivated on the beach, the flowers are often very large, and the flowers and fruits are extremely serious. Even if girdling is used at flowering stage, the results are few. The taproot of Chumen Wendan seedling of Tutuo rootstock is not obvious, usually there are 3 ~ 4 thick roots growing vertically downward, and there are more lateral roots and absorbing roots. The horizontal distribution of root system is 1.5 ~ 2 times the crown width, but the root system is the most in the range of 1.2 meters from the trunk. Sheep root system is mainly concentrated in 10 ~ 30 cm soil layer, and Hovenia dulcis Thunb root system is deeply distributed, mainly in 10 ~ 40 cm soil layer. In addition to the groundwater level, the depth of clay layer is also an important factor affecting the downward distribution of roots in Tu Hai Wentan Park, which must be paid attention to when building the park. Wendan, a historical Truman, was introduced by Xiamen pilgrims during Tongzhi period of Qing Dynasty, and was planted in Zhang Cun outside the Truman Mountain in Yuhuan in the early years of Guangxu period of Qing Dynasty. It has been cultivated for more than 30 years. After careful grafting, it is nutritious. Besides being eaten raw, the peel can also be used to make honey stacks, peel sugar and extract aromatic oil. 198265438+In February, Chumen Wendan was awarded the first prize of pomelo at the National Citrus Regional Conference; 1985 ranked first again in the national exhibition and evaluation of high-quality agricultural products. Besides being sold in big cities, it is also exported to Hong Kong, Macao and Taiwan and Southeast Asia. There is a sad and touching story about the origin of the name "Wendan". In other words, a famous Dan in Hua 'an County, Fujian Province, lost his parents early because of his high artistry and beautiful appearance. He has performed among the people for many years and has forged a deep friendship with the villagers. Later, he was insulted by the gentry and committed suicide in shame. The villagers pooled their money to bury her. A few years later, a grapefruit tree grew on her grave and produced many good grapefruit. People have been pruning grafting and named it "Wendan". According to experts' research, Wendan was improved by the local pomelo variety Mi Dan (Mi Dan: a kind of covered pottery named Ou without a cover, similar in appearance to Wendan) during the Wanli period of the Ming Dynasty.