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The Brown-Rosenberg Resistance Model of Crop Evapotranspiration Modified Tests in an Irrigated Sorghum Field¹

The Brown-Rosenberg (1973) resistance model was modified to simplify its calculation and increase its usefulness for estimating evapotranspiration. The model requires inputs of net radiation, air temperature, and vapor pressure and canopy and boundary layer resistance. The first three of these parameters are measured. In the modified version canopy resistance is estimated from a functional dependence on irradiance. The boundary layer resistance is estimated from a functional dependence on windspeed. The modification was tested in an irrigated sorghum (Sorghum bicolor Moench, cv ‘Rs 633’) field at Mead, Neb.

The model predictions generally agreed to within 10%, on both an hourly and daily basis, with direct lysimetric and Bowen ratio-energy balance measurements of evapotranspiration from the sorghum.

The Brown-Rosenberg model in its original and modified forms is useful when neither direct nor remotely sensed crop canopy temperature data are available and when there is need to evaluate the impact on evapotranspiration of several of the aforementioned environmental and crop parameters.

Key Words: Net radiation • Air temperature • Air vapor pressure • Canopy resistance • Stomatal resistance • Potential evapotranspiration

² Assistant professor and professor, Agricultural Meteorology Section, Dep. of Agricultural Engineering, Institute of Agriculture and Natural Resources, Univ. of Nebraska, Lincoln, NE 68583.

Received for publication June 10, 1976.