Abstract
This study was carried out to make clear the effects of day length on formation of winter-bud and new rhizome in Sasa nipponica. The plant materials used in this study were transplanted to pots from field in April, 1967 and grown under natural day length till the start of experiment. This study consisted of two experiments which were conducted in summer (July 1-July 31) and in autumn (August 13-October 31). Treatments imposed in both experiments were short day (8.5 hrs) and long day (15 hrs). Results obtained were as follows: 1. The short day length induced more winter-buds on rhizome than long day length. 2. The long day length, on the other hand, increased number of new rhizome than the short day length. 3. These results may suggest that the day length is a factor which is involved in the seasonal fluctuation patterns of numbers in winter-bud and new rhizome in the natural community of Sasa nipponica reported in the previous paper I.
