日本关于甘薯物质形成的研究是通过对干物重的变化或干物质向各器官的分配以了解干物量的形成情况。过去因缺乏光合作用的基础知识,所以进展不大。但进入50年代后采用生长分析法,生产结构分析法并利用光合测定装置等,使研究有了较大进展。如:角田观察了甘薯的器官、个体、群体对高产甘薯的生长势 Japan’s research on the formation of sweet potato material is based on the change of dry weight or the distribution of dry matter to various organs to understand the formation of dry matter. The past due to lack of basic knowledge of photosynthesis, so little progress. However, after the 1950s, using the method of growth analysis, the method of production structure analysis and the use of photosynthesis measuring devices, the research has made great progress. Such as: Kakuta observed sweet potato organs, individuals, groups of high-yield sweet potato growth potential