Penman-Monteith (PM-FAO) |
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Tmean, Tmax RHmin, RHmax, Rs, u2
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γ |
Standard method for estimating ETo. |
Allen et al. 1998ALLEN RG, PEREIRA LS, RAES D AND SMITH M. 1998. Crop evapotranspiration - Guidelines for computing crop water requirements. Irrig and Drain Pap, 56. U N Food and Agric Organ, Rome.
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Priestley-Taylor (PT) |
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Tmin, Tmax, RHmin, RHmax, Rs
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γ |
Simplification of the PM-FAO method - uses fewer variables in the calculation. |
Priestley and Taylor 1972PRIESTLEY CHB AND TAYLOR RJ. 1972. On the assessment of the surface heat flux and evaporation using large-scale parameters. Mon Weather Rev 100: 81-92. , Sentelhas et al. 2010SENTELHAS PC, GILLESPIE TJ AND SANTOS EA. 2010. Evaluation of FAO Penman-Monteith and alternative methods for estimating reference evapotranspiration with missing data in Southern Ontario, Canada. Agric Water Manage 97: 635-644., Allen 2000ALLEN RG. 2000. Ref-ET: Reference Evapotranspiration Calculation Software for FAO and ASCE Standardized Equations; version 3.1.15. Kimberly: University of Idaho Research and Extension Center ID, USA.
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Turc (TC) |
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Tmin, Tmax, Rs
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aT
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Gives good estimates for coastal and humid regions. |
Turc 1961TURC L. 1961. Estimation of irrigation water requirements, potential evapotranspiration: A simple climatic formula evolved up to date. Ann Agron 12: 13-49. , Allen 2000ALLEN RG. 2000. Ref-ET: Reference Evapotranspiration Calculation Software for FAO and ASCE Standardized Equations; version 3.1.15. Kimberly: University of Idaho Research and Extension Center ID, USA., Tabari 2010TABARI H. 2010. Evaluation of reference crop evapotranspiration equations in various climates. Water Resour Manage 24: 2311-2337.
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Temperature Based
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Hargreaves and Samani (HS) |
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Tmin, Tmax
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Method rarely recommended for regions with a humid climate. |
Hargreaves and Samani 1985HARGREAVES GH AND SAMANI ZA. 1985. Reference crop evapotranspiration from temperature. Appl Eng Agric 1: 96-99. , Allen et al. 1998ALLEN RG, PEREIRA LS, RAES D AND SMITH M. 1998. Crop evapotranspiration - Guidelines for computing crop water requirements. Irrig and Drain Pap, 56. U N Food and Agric Organ, Rome., Medeiros 1998MEDEIROS SLP. 1998. Avaliação de métodos de estimativa da evapotranspiração de referência para a região mesoclimática de Santa Maria-RS. RBAgro 6: 105-109. , Sousa et al. 2010 |
Camargo (CAM) |
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Tmin, Tmax
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K |
Requires only temperature data. |
Camargo 1971CAMARGO AP. 1971. Balanço hídrico no Estado de São Paulo. IAC (Boletim Técnico, 116), 24 p. , Pereira et al. 1997PEREIRA AR, VILLA NOVA NA AND SEDIYAMA GC. 1997. Evapo(transpi)ração. Piracicaba: Fealq.
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Thornthwaite (TH) |
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Tmin, Tmax
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Estimate of ETo using a monthly scale - it can be obtained using a daily scale by dividing by the number of days in the relevant month. |
Thornthwaite 1948THORNTHWAITE CW. 1948. An approach toward a rational classification of climate. Geogr Rev 38: 55-94. , Pereira et al. 2002PEREIRA AR, ANGELOCCI LR AND SENTELHAS PC. 2002. Agrometeorologia, fundamentos e aplicações práticas. Guaíba: Agropecuária.
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Hamon (HM) |
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Tmin, Tmax
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Uses only temperature data. |
Hamon 1961HAMON WR. 1961. Estimating potential evapotranspiration. J Hydraul Eng ASCE 87: 107- 120., Pereira et al. 2009, Caporusso and Rolim 2015CAPORUSSO NB AND ROLIM GS. 2015. Reference evapotranspiration models using diferents time scales in the Jaboticabal region of São Paulo, Brazil. Acta Sci Agron 37: 1-9.
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Kharrufa (KF) |
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Tmin, Tmax
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Method with simple calculation. |
Kharrufa 1985KHARRUFA NS. 1985. Simplified equation for evapotranspiration in arid regions. Beitr Hydrol 5: 39-47.
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