Abstract
The authors carried out an investigation on the growth progress and nutriment variation of Koiwai turnip, under the same culture condition from Oct. 8th (1965) to April 21th (1966), and the results obtained were as follows : 1. The fresh weight of top (leaf-blade) attaind to peak early in November. There-after, it diminished gradually in the course of defoliation of leaf-blade, transference of nutriments from top to root or consumption due to the respiration etc, and increased gradually according to the process of the growth of a flower-bud again. 2. The fresh weight of root showed a tendency to increase during the wintering processes under snow-drifts, and it diminished to get in the growth season of a flower-bud, but dry weight of root did not always increased under snow-drifts, and the storage nutriments (mainly total sugar contents) decreased to exhausting in the causes of the respiration etc. 3. As total weight of top and root attaind to maximum in mid December not only in the fresh and dry matter but also in the storage nutriment components, this season seemed to be the time of harvest. 4. Results obtained in comparing storage nutriments of chopped and non-chopped top during preservation for about 90 days after harvest showed that the nutriments of non-chopped top were transferred to root giving lower fresh weight loss of the root and slight gains of dry matter and storage nutriment of it than chopped top. But dead leaf-blade has no utility during preservation, it seems to be profitable to make best use of chopped top after harvest and to preserve topless root only.
