1981年选用12个品种8个品系,分别栽插春、夏薯,重复三次;1982年选用12个品种栽插夏薯,分别于不同时期进行同株干率的测定.春薯栽插60天,夏薯栽插40天进行第一测定,以后每20天一次.混合取样,切丝后放入干燥箱95～105℃烘至恒重,称重计算干率(以下同).选用重500克左右的徐薯18薯块,全部切丝混合取样,分10,15,20,30,50,100克(对照),于收获期,贮藏期中、后期分别测定,重复7～12次,分析样品数量与干率的关系. In 1981, 8 varieties of 12 varieties were selected and inserted into spring and summer potato respectively, repeated three times. In 1982, 12 varieties of sweet potato were planted and planted at different times, respectively. , Summer planting 40 days for the first determination, after every 20 days once mixed sampling, cut into the oven 95 ~ 105 ℃ drying to constant weight, weighed dry rate (the same below.) Selection of 500 Grams of about 18 potato tubers, all shredded mixed sampling, points 10,15,20,30,50,100 g (control), during harvest, storage period, the late were measured, repeated 7 to 12 times, the number of samples analyzed Relationship with the rate of dry.