Studies on Photosynthesis of Tea Plant (Part 2):On the Diurnal and Seasonal Changes of the Assimilation Rate of Tea Plant

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The authors measured the diurnal and seasonal changes of photosynthetic rate of tea plant with the apparatus described on the previous report. The . results obtained were as follows. 1. The rate of carbon assimilation increased with the increase of light intensity, but it reached its maximum at about 8-10 A. M. showing the light saturation. In midday it remained nearly constant, and it decreased after 3-4 P. M. with the decrease of light intensity. "Midday depression" was often observed in summer and autumn, but the cause of this phenomenon could not be detected. 2. The light saturation point was seemed to be about 0.5 cal./ min. cm2. in summer and autumn, but it somewhat decreased in winter. The compensation point was seemed to be about 0.03 cal. /min. cm2. 3. Concerning the relation between the assimilation and the temperature, when the light intensity was above 0.4 cal./min. cm2, the carbon assimilation rate was seemed to somewhat decrease with the rise of temperature. 4. The amount of carbon assimilation per day decreased remarkably in winter. It was thought that chlorophyll content and several other factors might have some effect on it.
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