Reference and Crop Evapotranspiration in South Central Nebraska. I: Comparison and Analysis of Grass and Alfalfa-Reference Evapotranspiration
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 134, Issue 6
Abstract
In Nebraska, historically, there have been differences among the water regulatory agencies in terms of the methods used to compute reference evapotranspiration to determine actual crop water requirements and hydrologic balances of watersheds. Because simplified and/or empirical temperature or radiation-based methods lack some of the major weather parameters that can significantly affect grass and alfalfa-reference ET ( and ) the performance of these methods needs to be investigated to help decision makers to determine the potential differences associated with using various equations relative to the standardized ASCE Penman–Monteith (ASCE-PM) equations. The performance of 12 and five equations were analyzed on a daily basis for south central Nebraska from 1983 to 2004. The standardized ASCE-PM and values were used as the basis for comparisons. The maximum ASCE-PM value was estimated as , and the highest value was estimated as on June 21, 1988. On this day, the atmospheric demand for evaporation was extremely high and the vapor pressure deficit (VPD) reached a remarkably high value of . The combination-based equations exhibited significant differences in performance. The 1963 Penman method resulted in the lowest RMSD of and its estimates were within 2% of the ASCE-PM estimates. The 1948 Penman estimates were similar to the 1963 Penman ( , ). Kimberly forms of alfalfa-reference Penman equations performed well with RMSD of for the 1972 Kimberly–Penman and for the 1982 Kimberly–Penman. The locally-calibrated High Plains Regional Climate Center (HPRCC) Penman method, ranked 6th, performed well and underestimated the ASCE-PM ET by 5% ( ). Most of the underestimations occurred at the high ET range and this was attributed to the upper limits applied by the HPRCC on VPD, and wind speed . The lack of ability of the radiation methods in accounting for the wind speed and relative humidity hindered the performance of these methods in the windy and rapidly changing VPD conditions of south central Nebraska. The 1977 FAO24 Blaney–Criddle method was the highest ranked (seventh) noncombination method ( , ). The FAO24 Penman estimates were within 4% of the ASCE-PM . Overall, there were large differences between the ASCE-PM and versus other equations that need to be considered when other forms of the combination or radiation and temperature-based equations are used to compute . We recommend that the ASCE-PM or equations be used for estimating when necessary weather variables are available and have good quality. The results of this study can be used as a reference tool to provide practical information, for Nebraska and similar climates, on the potential differences between the ASCE-PM and and other equations. Results can aid in selection of the alternative method(s) for reasonable estimations when all the necessary weather inputs are not available to solve the ASCE-PM equation.
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Acknowledgments
The writers would like to acknowledge the following sponsors of this study: UNL Water Center, UNL-Water Resources Research Initiative, USDA-NRCS, UNL-ARD, UNL Rural Initiative, UNL Gard Fund, and Burlington Northern Endowment, and Agricultural Research Division, University of Nebraska–Lincoln, Lincoln, Nebraska. The mention of trade names or commercial products is solely for the information of the reader and does not constitute an endorsement or recommendation for use by the University of Nebraska–Lincoln.
References
Allen, R. G. (1996). “Assessing integrity of weather data for reference evapotranspiration estimation.” J. Irrig. Drain. Eng., 122(2), 97–106.
Allen, R. G., Pereira, L. S., Raes, D., and Smith, M. (1998). “Crop evapotranspiration. Guidelines for computing crop water requirements.” FAO Irrigation and Drainage Paper No. 56, Food and Agriculture Organization, Rome.
Allen, R. G., and Pruitt, W. O. (1986). “Rational use of the FAO Blaney–Criddle formula.” J. Irrig. Drain. Eng., 112(2), 139–155.
Allen, R. G., Pruitt, W. O., Businger, J. A., Fritschen, L. J., Jensen, M. E., and Quinn, F. H. (1996). “Evaporation and transpiration.” ASCE manuals and reports on engineering practice No. 28, Hydrology Handbook, Chap. 4, ASCE, New York, 125–252.
ASCE and Environmental and Water Resources Institute (ASCE-EWRI). (2005). “The ASCE Standardized reference evapotranspiration equation.” Standardization of Reference Evapotranspiration Task Committee Final Rep., R. G. Allen et al., eds., ASCE, Reston, Va.
Burman, R. D., and Pochop, L. O. (1994). “Evaporation, evapotranspiration, and climate data.” Developments in atmospheric science, Vol. 22, Elsevier Science, Amsterdam, The Netherlands, 278.
Burman, R. D., Cuenca, R. H., and Weiss, A. (1983). “Techniques for estimating irrigation water requirements.” Advances in irrigation, Vol. 2, D. Hillel, ed., Academic, New York, 335–394.
Doorenbos, J., and Pruitt, W. O. (1975). “Guidelines for prediction of crop water requirements.” FAO Irrigation and Drainage Paper No. 24, Food and Agriculture Organization, Rome.
Doorenbos, J., and Pruitt, W. O. (1977). “Guidelines for prediction of crop water requirements.” FAO Irrigation and Drainage Paper No. 24 (revised), Food and Agriculture Organization, Rome.
Droogers, P., and Allen, R. G. (2002). “Estimating reference evapotranspiration under inaccurate data conditions.” Irrig. Drain. Syst., 16, 33–45.
Evans, G. N. (1971). “Evaporation from rice at Griffith, New South Wales.” Agric. Meteorol., 8, 117–127.
Freres, M., and Popov, G. F. (1979). “Agrometeorological crop monitoring and forecasting.” FAO Plant Production and Protection Paper 17, Food and Agriculture Organization, Rome, 36–43.
Frevert, D. K., Hill, R. W., and Braaten, B. C. (1983). “Estimation of FAO evapotranspiration coefficients.” J. Irrig. Drain. Eng., 109(2), 265–270.
Hargreaves, G. H., and Samani, Z. A. (1985). “Reference crop evapotranspiration from temperature.” Appl. Eng. Agric., 1(2), 96–99.
Hubbard, K. G. (1992). “Climatic factors that limit daily evapotranspiration in sorghum.” Clim. Res., 2, 73–80.
Irmak, A., and Irmak, S. (2008). “Reference and crop evapotranspiration in south central Nebraska: II. Measurement and estimation of actual evapotranspiration.” J. Irrig. Drain. Eng., 34(6), 700–715.
Irmak, S., Allen, R. G., and Whitty, E. B. (2003). “Daily grass and alfalfa-reference evapotranspiration estimates and alfalfa-to-grass evapotranspiration ratios in Florida.” J. Irrig. Drain. Eng., 129(5), 360–370.
Irmak, S., Irmak, A., Howell, T. A., Martin, D. L., Payero, J. O., and Copeland, K. S. (2008). “Variability of alfalfa-reference to grass-reference evapotranspiration ratios in growing and dormant seasons.” J. Irrig. Drain. Eng., 134(2), 147–159.
Irmak, S., Payero, J. O., Martin, D. L., Irmak, A., and Howell, T. A. (2006). “Sensitivity analyses and sensitivity coefficients of the standardized ASCE–Penman–Monteith equation to climate variables.” J. Irrig. Drain. Eng., 132(6), 564–578.
Jensen, M. E. (1969). “Scheduling irrigations using computers.” J. Soil Water Conservat., 24(8), 193–195.
Jensen, M. E. (1974). Consumptive use of water and irrigation water requirements, ASCE, New York.
Jensen, M. E., Burman, R. D., and Allen, R. G. (1990). “Evapotranspiration and irrigation water requirements.” ASCE manuals and reports on engineering practices No. 70, ASCE, New York.
Jensen, M. E., and Haise, H. R. (1963). “Estimating evapotranspiration from solar radiation.” J. Irrig. and Drain. Div., 89, 15–41.
Kincaid, D. C., and Heermann, D. F. (1974). “Sceduling irrigations using a programmable calculator.” USDA-ARS Rep. No. ARS-NC-12, U.S. Dept. of Agriculture, Washington, D.C.
Makkink, G. F. (1957). “Testing the Penman formula by means of lysimeters.” J. Inst. Water Eng., 11(3), 277–288.
Nebraska Department of Natural Resources (NDNR). (2004). LB 962, Nebraska revised statutes, Chap. 46, NDNR, Lincoln, Neb.
Penman, H. L. (1948). “Natural evaporation from open water, bare soil and grass.” Proc. R. Soc. London, Ser. A, 193, 120–146.
Penman, H. L. (1963). “Vegetation and hydrology.” Technical Communication No. 53, Commonwealth Bureau of Soils, Harpenden, U.K.
Priestley, C. H. B., and Taylor, R. J. (1972). “On the assessment of surface heat flux and evaporation using large-scale parameters.” Mon. Weather Rev., 100(2), 81–92.
Rosenberg, N. J. (1969). “Seasonal patterns in evapotranspiration by irrigated alfalfa in the central Great Plains.” Agron. J., 61, 879–886.
Rosenberg, N. J., Blad, B. L., and Verma, S. B. (1983). Microclimate: The biological environment, Wiley, New York.
Stephens, J. C., and Stewart, E. H. (1963). “A comparison of procedures for computing evaporation and evapotranspiration.” Publ. No. 62, Trans. Int. Union of Geodesy and Geophysics, Berkeley, Calif., 123–133.
Temesgen, B., Allen, R. G., and Jensen, D. T. (1999). “Adjusting temperature parameters to reflect well-watered conditions.” J. Irrig. Drain. Eng., 125(1), 26–33.
Turc, L. (1961). “Evaluation des besoins en eau d’irrigation, evapotranspiration potentielle, formule climatique simplifiee, et mise a jour.” Ann. Agron., 12(1), 13–49.
Van Bavel, C. H. M. (1966). “Potential evaporation: The combination concept and its experimental verification.” Water Resour. Res., 2(3), 455–467.
Wright, J. L. (1982). “New evapotranspiration crop coefficients.” J. Irrig. and Drain. Div., 108(2), 57–74.
Wright, J. L. (1996). “Derivation of alfalfa and grass reference evapotranspiration.” Evapotranspiration and Irrigation Scheduling, Proc., Int. Conf. of the Irrigation Association and Int. Committee on Irrigation and Drainage, C. R. Camp, E. J. Sadler, and R. E. Yoder, eds., American Society of Agricultural Engineers, St. Joseph, Mich.
Wright, J. L., and Jensen, M. E. (1972). “Peak water requirements of crops in Southern Idaho.” J. Irrig. and Drain. Div., 96(1), 193–201.
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Received: Jun 21, 2007
Accepted: Jan 7, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
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