Fig. 7. Effect of total pressure on the rate of net photosynthesis. The total pressure
was varied from 0.1 (atmospheric condition) to 0.3 MPa under two different absolute
humidities. The partial pressure of CO2 was 40 Pa, which was equivalent to that
of ambient air at 0.1 MPa. This result indicates that the rate of net photosynthesis
decreases linearly with the increase in total pressure regardless of humidity.