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To elucidate the seasonal and inter-annual variation of CO, exchanges between the atmosphere and paddy field, the CO, flux has been measured by the eddy correlation technique at the experimental farm of the Agricultural Faculty, Okayama University, since December in +332. The CO, sensor, however, does not work under rainy conditions. The improved aerodynamic technique was developed and used to fill the gap in the eddy flux data. This technique gave reasonable CO, fluxes even on rainy days. The reliability of the technique was also confirmed by comparing CO, fluxes with those measured by the eddy correlation technique.