Abstract
Direct measurements of fluxes of CO2 under field conditions are lacking. A sampling system based on a modified eddy correlation technique was constructed. It integrates over equal amounts of vertical air travel. It is designed to give the atmospheric flux of CO2 for any crop with a relative accuracy of approximately 10% for periods as short as 5 minutes to periods as long as a few hours. Samples of CO2 flux measurements above snow, bare soil and a legume hay crop are presented. These measurements combined with weather data will help in understanding how weather variations affect crop performance.
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