抄録
The authors studied with changes in sugar content in sugar beet plant sown in summer and in content impurities which interfere with the recovery of crystal sugar from sugar beet. The experimental results are summerized as follows: 1. In the sugar beet plant, sugar substance are translated most effectively from October to September and sucrose are accumulated in root rapidly. Then, content are increased a little in blade, reducing sugar and sucrose are increased in petiole, and sucrose content are increased gradually in crown and root of sugar beet. In winter, there are almost no changes in sugar content in plant except petiole. In the next spring, the sugar beet plant are grown again. In this period, reducing sugar and blue number are increased in early spring in root and crown of sugar beet and the sucrose are decreased rapidly. 2. Harmful nitrogen content are increased in winter and decreased in spring. There are no correlation between the content of harmful nitrogen and blue number from winter to spring. Soluble ash content in root of sugar beet are decreased in autumn and in late spring.
