抄録
The authors measured photosynthetic rate of tea plants grown in field, with an apparatus modified from that reported in part 1. After training, the rate of carbon assimilation (c. a.) decreased and midday rest was observed distinctly. Before plucking when tea shoots developed 4 leaves or more, the rate of c. a. reached its summit. At sprouting time or after training, 0.5 cal/cm2/min. was the light saturation point, and when the light intensity exceed 0.6∼0.8 cal, the rate of c. a. somewhat decreased. But before plucking time, up to 1.0 cal light intensity, the rate of c. a. increased with light, and excepting the period of midday rest, both the depression with light and the changes by temperature of c.a. were not observed.
