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Crop Evapotranspiration (ET) Estimation Models: A Review and Discussion of the Applicability and Limitations of ET Methods

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  • Abhinaya Subedi
  • José Chávez

Abstract

This is a review paper on existing methodologies to calculate crop evapotranspiration (ETc). We have attempted to present all the important ET estimation procedures to date starting from the simple empirical Blaney Criddle method to the complex Shuttleworth model. The common approach to calculate ETc is to estimate a reference crop ET rate (ETref) using weather variables from nearby weather station, and multiplying it by an appropriate crop coefficient (Kc). Recently, there have been attempts to calculate actual crop ET (ETa) directly without using Kc. The latter method is still in the developmental phase. This study reviews the existing literature on ET estimation and identifies research needs in the current methods and technology. The extension of the Shuttleworth model for hourly time step and the validity of the Irmak and Mutibwaa model at field level for various crops would be a good milestone for the one step ET estimation. Furthermore, there are indications that the development of a new variable canopy surface resistance (rc) model, which can be applicable for different crops at different climatic conditions, would be a good contribution in this field.

Suggested Citation

  • Abhinaya Subedi & José Chávez, 2015. "Crop Evapotranspiration (ET) Estimation Models: A Review and Discussion of the Applicability and Limitations of ET Methods," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 7(6), pages 1-50, May.
    • Handle: RePEc:ibn:jasjnl:v:7:y:2015:i:6:p:50
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    References listed on IDEAS

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    1. Blaney, Harry F. & Criddle, Wayne D., 1962. "Determining Consumptive Use and Irrigation Water Requirements," Technical Bulletins 171000, United States Department of Agriculture, Economic Research Service.
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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