Dioscorea batatas (Chinese Yam, Shan Yao) & Dioscorea opositifolia Short description and history of use Dioscorea batata is a plant of Chinese origin, growing in temperate climates, which produces a tuber similar in taste to the potato but superior in nutritional qualities. The Chinese yam is high in starch, Vitamin C and Calcium. It is used in the preparation of many Asian traditional dishes but also in traditional medicine. The tuber requires cooking and it can be prepared similar to a potato: it can be baked, boiled, fried, etc. It can also be mashed and served as a side dish or included as an ingredient in soups. As a medicinal plant, Shan Yao is considered a stimulant for the metabolism and it is used in the treatment of thyroid dysfunctions. It is also a tonic and a facilitator in the healing process of different diseases. The roots of the plant are used in the manufacture of hormonal drugs. It is studied in Britain as a commercial crop, as an alternative to the potato. The harvesting process seems to be an impediment at this time because the tuber tends to have very deep roots and taking it out can damage surrounding plants. Dioscorea batata is presently studied in Germany as well, within a programme conducted by the University of Kassel. The great advantage of cultivating this yam in western/northern Europe is that it can be grown outside without problems, thanks to its cold-hardiness. The same difficulties are observed here, namely the harvesting methods, and to a lesser extent, the marketing strategies, considering that the Chinese yam is relatively unknown in Europe. 47 Pagina 56
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