Evapotranspiration from a Snap Bean Crop¹

Abstract

Abstract A model is described in which transpiration from a loosely structured canopy is calculated from the potential evaporation, the evaporation from the soil, and the stomatal resistance weighted by the leaf area index of the field. Estimation of the evaporation from the soil requires the net radiation at the soil surface and the surface soil water content. A test of the model on snap beans ( Phaseolus vulgaris L.) resulted in a 4% overestimation attributed to the inaccuracy of the estimate of the evaporation from the soil.