Rhizoma Dioscoreae is born in the sunny mountain area, and likes to be warm and cold resistant. It can be overwintering if it is covered in the north. Because yam is a kind of deep rooted plant, the sandy loam with deep soil layer, good drainage and fertile vegetable and pine soil should be selected in the cultivation area. If the soil is acidic, it is easy to branch roots and nodules, which will affect the yield and quality of roots; The root can't grow down sufficiently if it is too alkaline. Therefore, in order to neutralize the acidity of soil, lime should be applied to the relatively acidic soil for cultivation in southern China.

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