the partial pressure of CO2 linearly increased with increasing total
pressure. These results indicate that absolute humidity also has
little effect on the rate of net photosynthesis. The rate of net photosynthesis
increased linearly with increasing total pressure and was
1.6-fold higher at 0.5 MPa that at 0.1 MPa.
Fig. 9 shows the relationship between the rate of gross photosynthesis
and the total pressure at high or low absolute humidity.
The rates of gross photosynthesis were calculated from the results