Sweet potato is a plant that

Sweet potato is a plant that grows well in hot and humid climates, the optimum temperature of 27 ° C and irradiation time 11-12 hours per day. This plant can grow to a height of 1,000 meters above sea level. Sweet potatoes do not require fertile soil for the growth media. Harvesting sweet potatoes in the lowlands is ± 16 weeks, whereas for plateau ± 24-25 weeks (Wargiono, 1989). Harvest sweet potatoes are an ideal starting at age 3 months, with delays at the latest until the age of 4 months. Crop at the age of more than 4 months, in addition to the risk of pest attack Boleng high enough, will not give rise yam results. Harvesting isRoller Blinds  done in excess can reduce the shelf life of optimum quality. Harvesting it should not result in cuts and bruises on the bulb in order to get good quality (Pantastico, 1986).
In the 1960 planting sweet potato has spread to all provinces in Indonesia. In 1968 Indonesia is the sweet potato number four in the world. Sweet potato production center is in West Java, Central Java, East Java, Irian Jaya, and Sumatra Utara.0,92-0,98%., Starch from 17.06 to 28.19%, from 1.19 to 2.07 Protein %, sugar 0.38 to 0.43%, from 2.16 to 5.24% crude fiber and beta-carotene from 17.42 to 51.20%. Therefore, sweet potato plays an important role in the food security community.
Almost all of the sweet potato can be used, namely a) Leaf: vegetables, fodder, b) Stem: planting materials, animal feed, c) potato skin: animal feed, d) fresh potato: groceries, e) sweet potato flour: food , f) sweet potato Starch: fermentation, animal feed, citric acid.
       In Japan, sweet potatoes traditionally used as food and promoted equal hamburgers and pizza. In these countries a variety of foods made ​​from yams are often found in stores and restaurants bertarap internationally. Sweet Potato Cilembu ST 1, since a long time to penetrate the markets of Singapore, Malaysia, Korea, and Japan.
      Ubi Cilembu ST 1, is one of the commodity crops seeded in Sumedang, these varieties have been released by the minister of agriculture in the year 2001 Cilembu sweet name taken from the name of the area of ​​origin of the potato produced the Village District of Pamulihan Cilembu, ST stands merupkan Sumedang Away, whereas figure Pulau Pramuka 1 shows that in Sumedang have local varieties of sweet potato that has the advantage of not much different from the Cilembu ST 1, but not yet released by the minister of agriculture.