Performance Evaluation of Reference Evapotranspiration Equations across a Range of Indian Climates

Reference crop evapotranspiration ( ET0 ) is a key variable in procedures established for estimation of evapotranspiration rates of agricultural crops. In recent years, there is growing evidence to show that the more physically based FAO-56 Penman–Monteith (PM) combination method yields consistently more accurate ET0 estimates across a wide range of climates and is being proposed as the sole method for ET0 computations. However, other methods continue to remain popular among Indian practitioners either because of traditional usage or because of their simpler input data requirements. In this study, we evaluated the performances of several ET0 methods in the major climate regimes of India with a view to quantify differences in ET0 estimates as influenced by climatic conditions and also to identify methods that yield results closest to the FAO-56 PM method. Performances of seven ET0 methods, representing temperature-based, radiation-based, pan evaporation-based, and combination-type equations, were compared ...

[1]  D. Sharma,et al.  Determination of evapotranspiration for maize and berseem clover , 2002, Irrigation Science.

[2]  S. Mohan.  Intercomparison of evapotranspiration estimates , 1991 .

[3]  G. Papaioannou,et al.  Reference crop evapotranspiration over Greece , 1991 .

[4]  Derrel L. Martin,et al.  Issues, requirements and challenges in selecting and specifying a standardized ET equation. , 2000 .

[5]  Devendra M. Amatya,et al.  Comparison of methods for estimating REF-ET , 1995 .

[6]  Lakshman Nandagiri,et al.  Sensitivity of the Food and Agriculture Organization Penman–Monteith Evapotranspiration Estimates to Alternative Procedures for Estimation of Parameters , 2005 .

[7]  Richard G. Allen,et al.  Comparison of Reference Evapotranspiration Calculations as Part of the ASCE Standardization Effort , 2003 .

[8]  Gabriel Katul,et al.  Collection and analysis of evaporative flux data for various climates , 1990 .

[9]  N. Raghuwanshi,et al.  Decision Support System for Estimating Reference Evapotranspiration , 2002 .

[10]  Robert W. Hill,et al.  Estimation of FAO Evapotranspiration Coefficients , 1983 .

[11]  George H. Hargreaves,et al.  Reference Crop Evapotranspiration from Temperature , 1985 .

[12]  S. Mohan,et al.  Relative importance of meteorological variables in evapotranspiration: Factor analysis approach , 1996 .

[13]  R. L. Snyder,et al.  An evaluation of common evapotranspiration equations , 1999, Irrigation Science.

[14]  Suat Irmak,et al.  Daily Grass and Alfalfa-Reference Evapotranspiration Estimates and Alfalfa-to-Grass Evapotranspiration Ratios in Florida , 2003 .

[15]  Pradeep Kashyap,et al.  Evaluation of evapotranspiration estimation methods and development of crop-coefficients for potato crop in a sub-humid region , 2001 .

[16]  C. H. Batchelor,et al.  A comparison of the Priestley-Taylor and Penman methods for estimating reference crop evapotranspiration in tropical countries , 1983 .

[17]  Christos Babajimopoulos,et al.  Analytical Estimation of Modified Penman Equation Parameters , 1997 .

[18]  L. S. Pereira,et al.  Crop evapotranspiration : guidelines for computing crop water requirements , 1998 .

[19]  B. Clothier,et al.  Measured and estimated evapotranspiration from well-watered crops , 1982 .

[20]  Vijay P. Singh,et al.  Cross Comparison of Empirical Equations for Calculating Potential Evapotranspiration with Data from Switzerland , 2002 .

[21]  Paul R. Lowe.  An Approximating Polynomial for the Computation of Saturation Vapor Pressure. , 1977 .