@article{Harmsen:256242,
      recid = {256242},
      author = {Harmsen, E. W. and Ramirez Builes, V. H. and Gonzales, J.  E. and Dukes, M. D. and Jia, X.},
      title = {Estimation of short-term actual crop évapotranspiration},
      address = {2006-07-09},
      number = {1872-2017-170},
      pages = {10},
      year = {2006},
      abstract = {A method is presented for estimating the hourly actual  évapotranspiration (ET) from short natural vegetation or  agricultural crops. The method consists of equating the ET  flux equations based on the generalized Penman-Monteith  (GPM) combination method and a humidity gradient (HG)  method. By equating the GPM and HG expressions, a single  unknown parameter, either the bulk surface resistance (rs)  or aerodynamic resistance (ra), can be determined. In the  procedure, the value of the resistance factor is adjusted  until the daily ET time series curves from the two methods  approximately coincide. An overview of the technical  approach and the results of a comparison between the new  method and an eddy covariance system at the University of  Florida at Gainesville are provided. To illustrate the  utility of the method an example is presented in which the  average daily ET was determined for a growing season of  common bean {Phaseolus vulgaris L.) at Juana Diaz, Puerto  Rico. In this example the surface resistance was measured  (i.e., stomatal resistance and leaf area) and estimated  using the proposed method. A third method was also  evaluated in which the surface resistance was estimated  using the equation of Ortega-Farias and Fuentes (1999). All  three methods were in close agreement.},
      url = {http://ageconsearch.umn.edu/record/256242},
      doi = {https://doi.org/10.22004/ag.econ.256242},
}