为评价天薯12号、定薯4号、庄薯3号、希森6号和青薯10号5个马铃薯品种的综合品质，以同一条件下生产的品种为试材，采用分级指数法对参试品种的单株块茎数、单株质量、单薯质量、商品薯率等经济性状和干物质、淀粉、蛋白质、维生素C、还原糖进行综合分级评价。结果表明，同一条件生长的不同马铃薯品种其田间表现和采后营养品质均存在较大差异，参试的5个品种中，青薯10号的综合评价指数最高，说明其综合品质最好；其余品种按综合评价指数由高到低依次为定薯4号、天薯12号、庄薯3号、希森6号。研究结果可为马铃薯的贮藏加工提供参考依据。

To comprehensive evaluate the quality of 5 potato varieties, i.e., Tianshu 12, Dingshu 4, Zhuangshu 3, Xisen 6 and Qingshu 10, using the 5 potato varieties that were produced under the same conditions as test materials, the graded index method was adopted to comprehensively evaluate the economic characters of tuber number per plant, tuber weight per plant, weight per tuber, commodity tuber rate etc., and contents of dry matter, starch, protein, vitamin C and reducing sugar by grade. The results showed that great differences were detected in the field performance and nutritional qualities of different potato varieties growing under the same conditions. Qingshu 10 had the highest comprehensive evaluation index among the 5 varieties which indicated its comprehensive quality was the best. Other varieties, based on their comprehensive evaluation indexes, were ranked as Dingshu 4, Tianshu 12, Zhuangshu 3, and Xisen 6 in descending order. The research results could provide reference basis for potatoes storage and processing.

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财政部和农业农村部国家现代农业产业技术体系资助(CARS-09-P26)；国家自然科学基金(32160596)；联合国世界粮食计划署项目(WFPGSPP-3)。