The effects of irradiance, temperature, humidity, and CO2 concentration on the rate of photosynthesis of one year tea plants were studied using Gas Exchange Measuring Station. The rate of photosynthesis was estimated by the CO₂ concentration in a sealed chamber containing a tea plant. The rate of photosynthesis of tea plants being cultivated in a greenhouse was also measured under full irradiating and 40% shading conditions using a portable photosynthesis tester. The light compensation point was 20-40 PPF(photosynthetic Photon Flux) and the light saturation point was higher than 900 PPF. The rate of photosynthesis of tea plants increased as temperature went up to 25˚C, and decreased at temperatures above 30˚C. The increase in decreased rate of photosynthesis. The carbon dioxide compensation point was 200ppm and the CO₂ saturation point was 1300ppm. Meiryoku showed the highest rate of photosynthesis among the 6 tea cultivars cultivated in a greenhouse. The rate of photosynthesis under 40% shading condition was 20% lower than the rate under full irradiating condition.
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