Abstract
1) When transplanting time is changed, the length of time interval of tillering in rush plant was remarkably influenced as shown in figure l, and so far as the author's investigations are concerned, shortest interval of tillering observed was about 5 days. 2) The interval length was influenced by irrigation water temperature; at lower temperatures more days were required between successive tillering, and at higher temperatures intervals became shorter. It was found that the optimum water temperature for tillering was about 20°-30°C. 3) Interrelations between air temperature and the length of tillering interval shows a curvilinear equation as given in figure 3. Calculating from this equation, we may estimate theoretical length of the interval of tiller emergence at any time throughout the year.
