Abstract
The present experiment, with the same purpose as the 8th report, was undertaken to make clear the effects of potassium deficiency at the early growth stage on the development of tillering buds in rice seedlings by a water culture method. The results obtained are as follows; 1. Even if the potassium deficiency at the early growth stage extended for quite a long period, the 2nd tillering bud grew well and tillered. Also among the 1st tillering buds, some tillers developed. However, as the period of potassium deficiency at the early growth stage became longer, the development of the 3rd tillering buds and subsequent tillering buds was remakably in hibited. 2. After having been shifted from potassium deficient level to the standard level, the 3rd tillering buds and the subsequent tillering buds in the treated plots were superior to the standard plot in their develoment, and they developed so well as the period of potassium deficiency became longer.
