Institute of Agricultural Products Processing, Chinese Academy of Agricultural Sciences, Beijing 100094)

Sweet potato has been planted in China for more than 400 years. Originally, it was the main food crop, but also an important industrial raw material and feed crop. With the continuous development of grain production in China, people eat fewer and fewer sweet potatoes directly, and the variety structure of sweet potatoes in China is relatively simple, so the production of sweet potatoes is gradually moving towards comprehensive processing, utilization and commercialization. Since the reform and opening up, people's living standards in China have been continuously improved, and people's preference for food has shifted from simply considering food and clothing to the demand for nutrition and health. Therefore, high-quality, nutritious, beautiful and pollution-free foods are increasingly favored by people. As a new type of health food, special sweet potato has attracted wide attention. Special sweet potato refers to sweet potato with unique characteristics and high economic value, nutritional value or processing value. With China's entry into WTO, the traditional industries will be severely impacted, and the pattern of sweet potato mainly based on grain and feed and the traditional extensive recipes will also be broken. The transformation of sweet potato from edible and feed to special use has become the future development direction. Therefore, it is urgent to study the development and industrialization of special sweet potato. Purple sweet potato is an excellent special variety newly developed to adapt to this form. & ltBR & gt Purple sweet potato, named Chuanshanzi, is a new sweet potato variety successfully introduced and bred from Kawasaki Farm in China. This kind of sweet potato is named after its purple skin is close to black and its flesh is purple. In today's advocating vegetarian food, eating wild food and eating black food, the market prospect of Chuanshanzi is extremely promising. Now people generally realize that the quality of raw materials plays a decisive role in the success or failure of the final product, and the variety not only determines the appearance quality of the finished product, but also directly affects its commodity value. Therefore, scientific cultivation should be carried out before and after cultivation, because these are the basis of post-harvest quality and processing quality. & ltBR & gt 1 high-yield cultivation techniques

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