The content of diosgenin in the underground part of blooming time of the Dioscorea nipponica is highest as 1.35%. The content of diosgenin in the underground part of withered time is lowest as 1.03%.

• 穿龙薯蓣根茎中花期薯蓣皂苷元含量最高为1.；35%25；枯萎期含量最低为1