Heat and moisture transfer from trimmed glasshouse crops

Abstract Trimmed crops of cotton, beans and saltbush were grown in a glasshouse, and measurements made of the radiation flux, soil heating and evapotranspiration rate. The energy-balance equation then yielded the sensible-heat flux between a crop and the air above, so that measurements of leaf and air temperatures gave the heat-transfer coefficient. The mass-transfer coefficient for a crop was found from the evaporation rate and the difference between the vapour pressures of the crop and the air. The heat and mass-transfer coefficients were not the same for different crops. The inverse of each coefficient gives the relevant diffusion resistance, and these were found to differ for heat and mass transfer, respectively, for any particular crop. The difference may be attributed either to buoyancy effects above the crop, or, more likely, to diffusion resistances within the leaves.

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