Crop evapotranspiration : guidelines for computing crop water requirements

(First edition: 1998, this reprint: 2004). This publication presents an updated procedure for calculating reference and crop evapotranspiration from meteorological data and crop coefficients. The procedure, first presented in FAO Irrigation and Drainage Paper No. 24, Crop water requirements, in 1977, allows estimation of the amount of water used by a crop, taking into account the effect of the climate and the crop characteristics. The publication incorporates advances in research and more accurate procedures for determining crop water use as recommended by a panel of high-level experts organised by FAO in May 1990. The first part of the guidelines includes procedures for determining reference crop evapotranspiration according to the FAO Penman-Monteith method. These are followed by updated procedures for estimating the evapotranspiration of different crops for different growth stages and ecological conditions.

[1]  O. Tetens,et al.  Uber einige meteorologische begriffe , 1930 .

[2]  Evaporation , 1941, Science.

[3]  C. W. Thornthwaite.  An Approach Toward a Rational Classification of Climate , 1948 .

[4]  H. L. Penman.  Natural evaporation from open water, bare soil and grass , 1948, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[5]  Irving M. Klotz,et al.  Symposia of the Society for Experimental Biology , 1952, The Yale Journal of Biology and Medicine.

[6]  J. H. Shaw,et al.  Thermal Radiation from the Atmosphere , 1956 .

[7]  J. F. Bosen.  AN APPROXIMATION FORMULA TO COMPUTE RELATIVE HUMIDITY FROM DRY BULB AND DEW POINT TEMPERATURES , 1958 .

[8]  Benjamin Y. H. Liu,et al.  The interrelationship and characteristic distribution of direct, diffuse and total solar radiation , 1960 .

[9]  C. B. Tanner,et al.  Potential evapotranspiration estimates by the approximate energy balance method of Penman , 1960 .

[10]  K. M. King,et al.  An Evaluation of the Thornthwaite and Mean Temperature Methods for Determining Potential Evapotranspiration1 , 1960 .

[11]  H. R. Haise,et al.  Estimating evapotranspiration from solar radiation , 1963 .

[12]  W. Pearsall,et al.  Vegetation and Hydrology , 1963, Nature.

[13]  W. E. Reeves,et al.  Transpiration by Sudangrass as an Externally Controlled Process , 1963, Science.

[14]  J. Rodda.  Forest Hydrology , 1965, Nature.

[15]  P. E. Rijtema.  An analysis of actual evapotranspiration , 1965 .

[16]  A. C. Chamberlain,et al.  Transport of gases to and from grass and grass-like surfaces , 1966, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[17]  John L. Merriam,et al.  A Management Control Concept for Determining the Economical Depth and Frequency of Irrigation , 1966 .

[18]  Marvin E. Jensen,et al.  Water consumption by agricultural plants , 1968 .

[19]  J. E. Christiansen,et al.  Pan Evaporation and Evapotranspiration from Climatic Data , 1968 .

[20]  I. F. Long,et al.  Surface Resistance of Crop Canopies , 1969 .

[21]  B. Hicks,et al.  Flux‐gradient relationships in the constant flux layer , 1970 .

[22]  C. Paulson.  The Mathematical Representation of Wind Speed and Temperature Profiles in the Unstable Atmospheric Surface Layer , 1970 .

[23]  E. K. Webb.  Profile relationships: The log‐linear range, and extension to strong stability , 1970 .

[24]  A. Thom.  Momentum absorption by vegetation , 1971 .

[25]  J. Ritchie,et al.  Influence of soil water stress on evaporation, root absorption, and internal water status of cotton. , 1971, Plant physiology.

[26]  A. Yaglom,et al.  Introduction to Obukhov's paper on ‘turbulence in an atmosphere with a non-uniform temperature’ , 1971 .

[27]  A. S. Thom,et al.  Momentum, mass and heat exchange of vegetation , 1972 .

[28]  C. Priestley,et al.  On the Assessment of Surface Heat Flux and Evaporation Using Large-Scale Parameters , 1972 .

[29]  Joe T. Ritchie,et al.  Model for predicting evaporation from a row crop with incomplete cover , 1972 .

[30]  Marvin E. Jensen,et al.  Peak Water Requirements of Crops in Southern Idaho , 1972 .

[31]  W. O. Pruitt,et al.  Momentum and mass transfers in the surface boundary layer , 1973 .

[32]  B. Hicks,et al.  Momentum, heat and water vapour transfer to and from natural and artificial surfaces , 1973 .

[33]  Norman J. Rosenberg,et al.  Lysimetric Calibration of the Bowen Ratio-Energy Balance Method for Evapotranspiration Estimation in the Central Great Plains , 1974 .

[34]  A. Dyer.  A review of flux-profile relationships , 1974 .

[35]  Paul R. Lowe,et al.  The Computation of Saturation Vapor Pressure , 1974 .

[36]  D.R Grant.  Comparison of evaporation from barley with Penman estimates , 1975 .

[37]  Evaluating Irrigation Needs for Southeastern U.S.A. , 1975 .

[38]  Marvin E. Jensen,et al.  Changes in Climate and Estimated Evaporation Across a Large Irrigated Area in Idaho , 1975 .

[39]  J. Gash,et al.  Comparison of aerodynamic and energy budget estimates of fluxes over a pine forest , 1975 .

[40]  R. Ayers,et al.  Water quality for agriculture , 1976 .

[41]  C. B. Tanner,et al.  Estimating Evaporation and Transpiration from a Row Crop during Incomplete Cover1 , 1976 .

[42]  P. Jarvis.  The Interpretation of the Variations in Leaf Water Potential and Stomatal Conductance Found in Canopies in the Field , 1976 .

[43]  H. Hottel.  A simple model for estimating the transmittance of direct solar radiation through clear atmospheres , 1976 .

[44]  E. Kanemasu,et al.  Evapotranspiration Model Tested for Soybean and Sorghum1 , 1976 .

[45]  Nader Katerji,et al.  A new device for continuous recording of the energy balance of natural surfaces , 1976 .

[46]  H. R. Oliver,et al.  On Penman's equation for estimating regional evaporation , 1977 .

[47]  J. Doorenbos,et al.  Guidelines for predicting crop water requirements , 1977 .

[48]  Etude de l'évapotranspiration réelle d'une culture de blé dans le bassin parisien , 1977 .

[49]  F. Hashemi,et al.  Limitations of temperature-based methods in estimating crop evapotranspiration in arid-zone agricultural development projects , 1979 .

[50]  M. Frere,et al.  Agrometeorological crop monitoring and forecasting , 1979 .

[51]  Keith Beven,et al.  A sensitivity analysis of the Penman-Monteith actual evapotranspiration estimates , 1979 .

[52]  J. Doorenbos,et al.  Yield response to water , 1979 .

[53]  A. Pearce,et al.  Rainfall interception in a forest stand estimated from grassland meteorological data , 1980 .

[54]  R. J. Hanks,et al.  Modeling crop responses to irrigation in relation to soils, climate, and salinity , 1980 .

[55]  Alain Perrier,et al.  Etude “In Situ” de l'evapotranspiration reelle d'une culture de ble , 1980 .

[56]  A. Frank.  Effect of Leaf Age and Position on Photosynthesis and Stomatal Conductance of Forage Grasses1 , 1980 .

[57]  Crop Coefficient for Estimates of Daily Crop Evapotranspiration , 1981 .

[58]  D. Wehner,et al.  Heat Tolerance of Kentucky Bluegrasses, Perennial Ryegrasses, and Annual Bluegrass1 , 1981 .

[59]  Summer Regrowth of Tall Fescue: Stubble Characteristics and Microenvironment 1 , 1981 .

[60]  James L. Wright,et al.  New Evapotranspiration Crop Coefficients , 1982 .

[61]  R. Shaw,et al.  Aerodynamic roughness of a plant canopy: A numerical experiment , 1982 .

[62]  Richard H. Cuenca,et al.  Application of Penman Equation Wind Function , 1982 .

[63]  W. Brutsaert.  Evaporation into the atmosphere , 1982 .

[64]  D. K. Cassel,et al.  Field‐Measured Limits of Soil Water Availability as Related to Laboratory‐Measured Properties , 1983 .

[65]  James L. Wright,et al.  Weather Station Siting and Consumptive Use Estimates , 1983 .

[66]  M. Field,et al.  The meteorological office rainfall and evaporation calculation system -- MORECS , 1983 .

[67]  Estimating Consumptive Use on a Statewide Basis , 1983 .

[68]  Reinder A. Feddes,et al.  Simulation model of the water balance of a cropped soil: SWATRE , 1983 .

[69]  W. J. Alves,et al.  Response of tall fescue to irrigation water salinity, leaching fraction, and irrigation frequency , 1983 .

[70]  Alain Perrier,et al.  Modélisation de l'évapotranspiration réelle ETR d'une parcelle de luzerne : rôle d'un coefficient cultural , 1983 .

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

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

[73]  K. G. McNaughton,et al.  Using the Penman-Monteith equation predictively , 1984 .

[74]  Evaporation and Potential Evaporation - a Practical Approach for Agricultural Engineers , 1984 .

[75]  J. Monteith.  Evaporation from land surfaces: progress in analysis and prediction since 1948 , 1985 .

[76]  George H. Hargreaves,et al.  Agricultural Benefits for Senegal River Basin , 1985 .

[77]  Ariel Dinar,et al.  Crop‐Water Production Function Model for Saline Irrigation Waters , 1985 .

[78]  A. Dinar,et al.  Simulated crop water production functions for several crops when irrigated with saline waters , 1986 .

[79]  Richard G. Allen,et al.  A Penman for All Seasons , 1986 .

[80]  Richard G. Allen,et al.  Rational Use of the FAO Blaney-Criddle Formula , 1986 .

[81]  Brent Clothier,et al.  ESTIMATION OF SOIL HEAT FLUX FROM NET RADIATION DURING THE GROWTH OF ALFALFA , 1986 .

[82]  A. Battikhi,et al.  Watermelon (Citrullus lanatus) Production under Mulch and Trickle Irrigation in the Jordan Valley , 1986 .

[83]  A. Battikhi,et al.  Irrigation Scheduling and Watermelon Yield Model for the Jordan Valley , 1986 .

[84]  Marvin E. Jensen,et al.  Thermodynamic Factors in Evapotranspiration , 1987 .

[85]  S. Idso,et al.  Analysis of an empirical model for soil heat flux under a growing wheat crop for estimating evaporation by an infrared-temperature based energy balance equation , 1987 .

[86]  Richard L. Snyder,et al.  Using reference evapotranspiration (ETo) and crop coefficients to estimate crop evapotranspiration (ETc) for trees and vines. , 1987 .

[87]  R. L. Snyder,et al.  Using reference evapotranspiration (ETo) and crop coefficients to estimate crop evapotranspiration (ETc) for agronomic crops, grasses, and vegetable crops , 1987 .

[88]  J. Wright.  Daily and seasonal evapotranspiration and yield of irrigated alfalfa in southern Idaho , 1988 .

[89]  Joost A. Businger,et al.  A note on the Businger-Dyer profiles , 1988 .

[90]  A. Battikhi,et al.  Irrigation scheduling and cantaloupe yield model for the Jordan Valley , 1988 .

[91]  S. Running,et al.  A general model of forest ecosystem processes for regional applications I. Hydrologic balance, canopy gas exchange and primary production processes , 1988 .

[92]  S. L. Harp,et al.  Crop coefficients for peanut evapotranspiration , 1988 .

[93]  Marvin E. Jensen,et al.  Operational estimates of reference evapotranspiration , 1989 .

[94]  S. B. Verma.  Aerodynamic resistances to transfers of heat, mass and momentum , 1989 .

[95]  J. Stewart.  On the use of the Penman-Monteith equation for determining areal evapotranspiration , 1989 .

[96]  C. R. Lloyd,et al.  Micrometeorological measurements in Les Landes forest during HAPEX-MOBILHY , 1989 .

[97]  J. Stewart,et al.  Preliminary modelling of transpiration from the fife site in Kansas , 1989 .

[98]  B. S. Piper.  Sensitivity of Penman estimates of evaporation to errors in input data , 1989 .

[99]  Dale F. Heermann,et al.  Development of reflectance-based crop coefficients for corn , 1990 .

[100]  J. T. Ritchie,et al.  Soil and plant factors affecting evaporation. , 1990 .

[101]  Michael A. Kizer,et al.  Hourly ET Model Calibration with Eddy Flux and Energy Balance Data , 1990 .

[102]  J. Wallace,et al.  The estimation of transpiration from sparse dryland millet using stomatal conductance and vegetation area indices , 1990 .

[103]  R. Allen,et al.  Evapotranspiration and Irrigation Water Requirements , 1990 .

[104]  Richard G. Allen,et al.  Report on the Expert Consultation on Procedures for Revision of FAO Guidelines for Prediction of Crop Water Requirements. Rome, Italy, 28-31 May 1990 , 1991 .

[105]  R. Cuenca,et al.  History of Lysimeter Design and Effects of Environmental Disturbances , 1991 .

[106]  Joe T. Ritchie,et al.  Temperature and Crop Development , 1991 .

[107]  Shashi B. Verma,et al.  Modeling canopy stomatal conductance in a temperate grassland ecosystem , 1991 .

[108]  Grass Reference Measurements in Italy , 1991 .

[109]  Field Experience with Hydraulic Weighing Lysimeters , 1991 .

[110]  Gerald N. Flerchinger,et al.  Modeling plant canopy effects on variability of soil temperature and water , 1991 .

[111]  Richard G. Allen,et al.  FAO‐24 Reference Evapotranspiration Factors , 1991 .

[112]  Marvin E. Jensen,et al.  History of Lysimeter Design and Use for Evapotranspiration Measurements , 1991 .

[113]  A. Tuzet,et al.  Land Surface Processes: Description, Theoretical Approaches, and Physical Laws Underlying Their Measurements , 1991 .

[114]  Development of Crop Coefficients Using Lysimeters , 1991 .

[115]  Marvin E. Jensen,et al.  Environmental Requirements of Lysimeters , 1991 .

[116]  Design and evaluation of net radiometers , 1991 .

[117]  Precision of Evapotranspiration Estimates Using Neutron Probe , 1992 .

[118]  Richard L. Snyder,et al.  Evapotranspiration Data Management in California , 1992 .

[119]  R. W. Hill,et al.  Evapotranspiration from Isolated Stands of Hydrophytes: Cattail and Bulrush , 1992 .

[120]  Shashi B. Verma,et al.  Comparison of surface fluxes and conductances at two contrasting sites within the FIFE area , 1992 .

[121]  Reinder A. Feddes,et al.  SWACROP: A water management and crop production simulation model. , 1992 .

[122]  Smith Martin,et al.  Cropwat : a computer program for irrigation planning and management , 1992 .

[123]  J. D. Rhoades,et al.  The use of saline waters for crop production , 1992 .

[124]  D. Vidal-Madjar,et al.  Estimation of stomatal resistance and canopy evaporation during the HAPEX-MOBILHY experiment , 1992 .

[125]  Joseph Shalhevet,et al.  Using water of marginal quality for crop production: major issues , 1994 .

[126]  Larry O. Pochop,et al.  Evaporation, Evapotranspiration and Climatic Data , 1994 .

[127]  Miguel Pastor Muñoz-Cobo.  Riego deficitario del olivar: Los programas de recorte de riego en olivar , 1994 .

[128]  W. G. M. Bastiaanssen,et al.  Regionalization of surface flux desities and moisture indicators in composite terrain , 1995 .

[129]  Terry A. Howell,et al.  Evapotranspiration of Irrigated Winter Wheat — Southern High Plains , 1995 .

[130]  Francis H. S. Chiew,et al.  PENMAN-MONTEITH, FAO-24 REFERENCE CROP EVAPOTRANSPIRATION AND CLASS-A PAN DATA IN AUSTRALIA , 1995 .

[131]  M. Dingkuhn,et al.  Climatic determinants of irrigated rice performance in the Sahel — I. Photothermal and micro-climatic responses of flowering , 1995 .

[132]  Jayantha Obeysekera,et al.  Lysimeter Study of Evapotranspiration of Cattails and Comparison of Three Estimation Methods , 1995 .

[133]  C. R. Camp,et al.  Evapotranspiration and irrigation scheduling , 1996 .

[134]  B. Itier.  Measurement and Estimation of Evapotranspiration , 1996 .

[135]  B. K. Khosla,et al.  Agricultural Salinity Assessment and Management , 1996 .

[136]  James L. Wright,et al.  Translating Wind Measurements from Weather Stations to Agricultural Crops , 1997 .

[137]  Richard G. Allen,et al.  Self-Calibrating Method for Estimating Solar Radiation from Air Temperature , 1997 .

[138]  L. S. Pereira,et al.  PROPOSED REVISION TO THE FAO PROCEDURE FOR ESTIMATING CROP WATER REQUIREMENTS , 1997 .

[139]  Improved water and soil management for sustainable agriculture in the Huang-Huai-Hai rivers plain, north China , 1998 .

[140]  Richard L. Snyder,et al.  New crop coefficients estimate water use of vegetables, row crops , 1998 .

[141]  Luis S. Pereira,et al.  AERODYNAMIC AND SURFACE RESISTANCES OF COMPLETE COVER CROPS: HOW GOOD IS THE “BIG LEAF”? , 1998 .

[142]  Modelling forest transpiration from climatological data , .