Abstract
In this study, we estimated the new available moisture on Sedum (Kirinsou) from an experiment using pots for measuring the amount of transpiration in a growth chamber under two different conditions, optimum and high temperature. The results are as follow; 1) Transpiration was confirmed during the dark period under both conditions, although the transpiration ratio in the optimum temperature condition was higher than the hot condition. 2) The relationship between the cumulative daily transpiration ratio and elapsed time fit secondary and logarithm functions precisely. 3) The activity of transpiration was confirmed under the condition of soil moisture less than pF4.2, with the water held in the plant contributing to this transpiration 4) Considering the total available moisture including with water in the plant can help save the amount of irrigation water needed better than considering soil moisture alone.
