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介绍了对甘薯食用，食品加工用新品种“渝薯２０”的生产力和主要经济性状的鉴定结果，在重庆市甘薯新品种区域试验中，“渝薯２０”３年平均鲜薯产量为２７．０７ｔ／ｈｍ￣２，薯干产量为７．４３ｔ／ｈｍ￣２，藤叶产量为２５．１７ｔ／ｈｍ￣２。其中，鲜薯产量比对照品种“徐薯１８”增产１１．６７％；薯干和藤叶产量比其减产２．８８％和２３．１５％。该品种薯块烘干率２７．４７％，含淀粉１８．７％、Ｖｃ１９．６ｍｇ／１００ｇ、β－胡萝卜素４６９．６μｇ／１００ｇ；以干基计，含粗蛋白３．８％、氨基酸３．３％、可溶性糖１２．４％。“渝薯２０”萌芽性、耐贮性好，结薯较早，净同化率高，抗旱性、早收性、抗黑斑病性较好，１９９３年已推广４０００ｈｍ￣２以上。
The identification results of productivity and major economic traits of a new sweet potato variety “Yuzhu 20” were introduced. In the regional trial of sweet potato variety in Chongqing, the average fresh potato yield of “Chongqing 20” was 27 in 3 years. 07t / hm ~ 2, dried potato yield of 7.43t / hm ~ 2, vine leaf yield of 25.17t / hm ~ 2. Among them, the yield of fresh potato increased by 11.67% than that of the control variety “Xu-Shu 18”; the yield of dried potato and vine leaves decreased by 2.88% and 23.15% respectively. The drying rate of the potato variety was 27.47%, starch content was 18.7%, Vc was 19.6mg / 100g and β-carotene content was 469.6μg / 100g. The content of crude protein was 3.8%, amino acid 3 .3%, soluble sugar 12.4%. “Chongqing potato 20” sprouting, good storage, early tuber, net assimilation rate, drought resistance, early harvest, anti-black spot disease is better, in 1993 has been promoting 4000hm ~ 2 above.