抄録
In order to obtain some informations on the behavior or translocation and storage of nitrogen compounds in the root tubers during the growing period, the present investigation was undertaken with sweet potatoes of the variety "Gokoku" as material. The experimental results obtained may be summarized as follows : 1. At the early stage of tuber growth, the protein-N contents were relatively high and the prominent contents of soluble-N were also recognized, but they display a tendency to decrease concomitant with the march of their development. 2. In accordance with the vigorous growth of the root tuder, the protein-N contents showed the increasing tendency, and the soluble-N contents also increased slightly. 3. Concomitant with the maturity of the tuber, the successive increase of both protein-N and soluble-N contents were ascertained, though the fomer was striking. 4, Throughout an entire period of tuber development, the protein-N contents were always higher than those of soluble ones and the protein-N, and soluble-N contents in the pith were generaly higher than those in the cortex.
