Abstract
The authors measured photosynthetic rate of tea plant with an apparatus modified from that of Dr. Matsushima. The results obtained were as follows. 1) The rate of carbon assimilation reached its maximum at about 8 of 10 A.M., and decreased after 3 or 4 P.M. with the decrease of light intensity. In midday, it remained nearly constant, but "midday depression" was often observed in summer and autumm. 2) The light saturation point seemed to be about 0.5 cal/min, cm2. 3) The rate of carbon assimilation somewhat decreased with the increase of temperature when light intensity was above 0.4 cal/min, cm2. 4) The amount of assimilation per day decreased remarkably in winter. Chlorophyll contents and some other factors seemed to have relations to the phenomenon.
