Cultivation Technique for HIgh-yield and -quality of Medicinal Dioscorea nipponica

Saponin extracted from Dioscorea nipponica is a necessary intermediate compound to the synthesis of more than 50 kinds of hormone substance,such as cortison,ascensive,deltacortison,gesterol and sex hormone et.al.Spaonin is called medicine gold,because it can't be cynthesized by chemical reaction and must be extracted from such plants as dioscorea nipponica.In addition to dioscorea nipponica does not meet the need in current market.Therefore, planting Dioscorea nipponica could produce ideal benefits.This paper introduces briefly and generally the methods on Dioscorea nipponica cultivation.