抄録
To improve the quality of table-use sweet potetoes, the author carried out the study regarding the quality which has become important in the marketing. The results regarding Norin No. 1 were as follows: 1) No correlation between yield and quality was recognized. 2) Some correlations between the quality and leaf-color in the field were observed; accordingly, the color of the leaves gives a key to grade the quality of the sweet potatoes. 3) Furthermore, the skin-color has some correlation with quality, therefore the skin-color is helpful to judge the quality. This may be applied for the agricultural products inspection. 4) Many charactars constituting the quality had correlation, respectively, however, no correlation was found between the kind of soils and the quality. In Kokei No. 14, earliest variety, any correlations was not found among the items consisting the quality, but in this variety, numbers of sweet potatoes floated on the water, because they were lighter than the water.
