抄録
1. In the paddy field of sandy soil, that "Akiochi" is inevitable, but only the equipment of drainage is very good, was made the experimental research on the effects of the treatment of the growth accerate substances up on the roots of rice seedlings. 2. The growth accerate substances used for this research were Heteroxin, Naphthalene Acetic Acid, each manufactured at "Sankyo", and "Koa plant Hormone" (Alfa), manufactured at Koa Phisico and Chemistry Laboratory, and their concentrations used were respectively 0.01% and 0.005% in Heteroxin, 0.005% and 0.001% in Naphthalene Acetic Acid and Alfa. And the hours of treatment were ench 3 hours. 3. The vaiieties of rice used were Norin "No.8" and "Senbon Asahi", Thbe experimental results appeared on the investigatins of the growth and harvest showed the effect, by the treatment of the growth accerate substances, Namely, the divisions of treatment promoted the growth of the length, lifted per cent of available tillers, increased one ear weight, because of them increased the harvest, and it was recognized that the effects of the growth accerate substance were remarkeble great more in "Norin No.8" than in "Senbon asahi". 4. In paddy field of sandy soil, the effects of the treatment of the growth accerate substances on the seedlings of rice were believed to be the usefull technics of cultivation as one method of the removal of "Akioch".
