Abstract：‘Zhengshu No.9’was developed by crossing female parent‘Zaodabai’with male parent‘Yumalingshu No.1’. It is an early mature variety. The total growth period is about 56 days. It yields about 18 t•hm-2. This variety is of ellipse tuber shape with yellow tuber skin, white flesh，shallow eyes, and high marketable tuber weight percentage 89.08 %-100 %. Its starch content is 11.8 % with 252 mg•kg-1 VC, 2.52 % protein, 0.32 % reducing sugar. It is resistant to virus disease, late blight and ring rot. It is suitable for cultivation in spring and autumn or only in spring as early cultivation.
