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This study was to explore the effects of CO₂ enrichment on photosynthesis of Capsicum annuum L. under various light and temperature conditions. Effects of increasing temperature on respiration of the plant were also examined. The results are as follows: 1. The light saturation point of ´Komyong´ and ´Taemyong´ was 60 Klux, and that of ´Tabok´ was 80 Klux. Under light condition of 60 Klux, ´Tabok´ showed the highest photosynthetic rate, followed by ´Komyong´. 2. Photosynthetic rate for three cultivars was the highest at 25℃. Respiration rate at 30℃ was the highest for ´Tabok´ , followed by ´Komyong´ and ´Taemyong´ in this order. 3. The effect of CO₂ enrichment on the photosynthetic rate was the highest for ´Tabok´ , followed by ´Komyong´ and ´Taemyong´ in this order. The effect was rapidly increased as the CO₂ concentration increased from 500 to 1,000 ppm, but there was no significant difference between 1,000 ppm and 1,500 ppm. 4. High C02 enrichment (1,000ppm or higher) improved photosynthetic rate of ´Komyong´ even at 15 C and 20 Klux (relatively low temperature and low light intensity). At 20℃ and 40 Klux, the photosynthetic rate of the cultivar treated by 1,000 ppm CO₂ was 2 times higher than that of the cultivar without any CO₂ treatment. The light saturation of the cultivar reached at 30℃ and 60 Klux. 5. The CO₂ treatment of 1,000 ppm is regarded as the most suitable for clutivation of the three cultivars.
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