Synopsis Rates of exchange calculated from measurements of wind velocity and CO 2 gradients in the turbulent air stream were in the same order of magnitude as those calculated by another method and the aerodynamic method does not alter the crop environment. Turbulence may be a limiting factor in supply of CO 2 to an active crop on sunny days. Photosynthesis efficiency was 5% at midday and nearly 8% for total daylight period on a single day.
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E. R. Lemon (1960) studied this question.