Promoting net photosynthesis and CO2 utilization efficiency by moderately increased CO2 concentration and air current speed in a growth chamber and a ventilated greenhouse
2011
Thongbai, P., Chiba Univ., 648 Matsudo, Chiba 271-8510 (Japan). Graduate School of Horticulture. | Kozai, T., Chiba Univ., Kashiwa-no-ha 6-2-1, Kashiwa, Chiba 277-0882 (Japan). Center for Environement | Ohyama, K., Chiba Univ., 648 Matsudo, Chiba 271-8510 (Japan). Graduate School of Horticulture.
CO2 gas was supplied at a rate of 0 or 3 mL/min to the growth chamber with 2-3 air exchanges per hour, and air current speed of 0.3 m/s inside the growth chamber, in which tomato seedlings were placed. The CO2 concentration in the chamber decreased from 790 on day 1 to 440 umol/mol on day 7 when CO2 was supplied, whereas it decreased from 330 to 200 umol/mol in the control, where CO2 was not supplied, and ambient CO2 concentration was 410 umol/mol. On day 7, the net photosynthetic rate and leaf area index were 2.5 and 1.3 times, respectively, higher in the treated than in the control, and 96% of CO2 supplied to the chamber was fixed by plants for photosynthesis. The net photosynthetic rate also increased significantly when the air current speed changed from 0.3 to 1.0 m/s without supply of CO2. These results suggest in a fully ventilated greenhouse in a hot climate region, the net photosynthetic rate may increase either by making the CO2 concentration close to the ambient or by increasing the air current speed up to 1.0 m/s.
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