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Carbon dioxide was released at ground level in a cotton (Gossypium hirsutum L.) field, and the flux above the crop was measured. The aerodynamic and energy balance methods of calculating carbon dioxide flux underestimated the measured flux by approximately the same amounts. There was considerable variability in the difference between measured and calculated fluxes, and little correlation with meteorological parameters could be found. Differences between measured and calculated fluxes were slightly less with wind orientation across the rows than with orientation parallel to the rows.
Key Words: Microclimate Energy balance Aerodynamic Flux Cotton
2 Research Soil Scientists, USDA, Watkinsville, Georgia 30677; Watkinsville, Georgia; State College, Mississippi 39762; and Raleigh, North Carolina 27607; respectively.
Received for publication October 21, 1972.
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