Abstract
In order to make clear the physiological characters of rice root grown in ill-drained paddy field, the authors have examined seasonal changes of chemical constituents of rice root and also influences of amount of nitrogen and calcium silicate fertilizers supplied to them. Results obtained are shown in Fig. 1 to Fig. 8. It was recognized that physiologically active root, for instance, which were grown in well-drained field, was in high level of phosphate and protein-nitrogen. Based upon the above facts, the author have concluded that phosphate might be considered to be a most sensitive element as an indicator showing physiological activity of rice root. Iron and silicate are absorbed in surface of rice root with growth and they may be necessary for maintaing physiological activity of rice rot, but the further experiments are required to clear up their relationships.
