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In semi-arid regions, the contribution of fluxes from the bare soil to the total fluxes of heat, water vapour and momentum is considerable. A simple technique is presented to estimate the sensible heat from the soil by using Nusselt numbers. This technique has been tested with measurements collected during the EFEDA-2 experiments in Spain under mixed convective and forced convective conditions. The results obtained with the Nusselt number technique agree well with the sensible heat flux measured by the eddy-correlation technique. (C) 1997 Elsevier Science Ltd.