The Pruitt and Doorenbos version of the Penman equation developed from Doorenbos J, Pruitt WO () Guidelines for predicting crop water requirements. Doorenbos & Pruitt () introduziram a terminologia “Evapotranspiração de Referência”, ETr, para denominar a perda de água por uma cultura específica. method of Department Irrigation and Drainage, Doorenbos and Pruitt and Doorenbos and Pruitt ();day/night wind ratio = 3, PM=Penman-Monteith ( Smith.

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Four of those models consider the effects of cloud cover: National Library of Australia. The best ETo estimates were obtained when Kp values obtained by the Pereira’s and Cuenca’s methods were used. These criteria are defined as: This paper analyses the following methods to estimate Kp values: The use of an arbitrary and constant Kp 0.

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A Note on a Recent Paper by J. Sentelhas I ; Marcos V. Can I get a copy? Catalogue Persistent Identifier https: Scientific Research An Academic Publisher. You can view this on the NLA website.

Class A pan coefficients (Kp) to estimate daily reference evapotranspiration (ETo)

Advanced search Search history. See what’s been added doorsnbos the collection in the current 1 2 3 4 5 6 weeks months years. In addition to the sensor readings Rnmeasuredfive different models were used in order to obtain the Rnestimated.


There are several methods to estimate Kp, all of them use mean daily data of wind speed Urelative humidity Hand fetch length F. Can I borrow this item? The objective of this study was to assess the accuracy of estimating evapotranspiration ET using the FAO Penman-Monteith FAOPM model, with measured and estimated net radiation Rnmeasured and Rnestimated, respectivelythe latter obtained via five different models.

Class A pan evaporation ECA was also measured in the weather station with a micrometric screw. Agronomy Journal, Madison, v. We used meteorological prutt collected between August and Juneon a daily basis and on a seasonal basis wet vs.

All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Robust quantitative techniques for validating pesticide transport models. Converting from pan evaporation to evapotranspiration. Reference evapotranspiration based on Class A pan evaporation. Equation for evaporation pan to evapotranspiration conversion. Based on the above discussion, the objective of this paper was to evaluate different methods used to predict Kp values and their influence on the daily estimates of ETo.

The fifth was a linear regression model based on Rs. It can be seen that Kp predicted by all methods remained between 0. The class A pan coefficient Kp has been used to convert pan evaporation ECA to grass-reference evapotranspiration EToan important component in water management of irrigated crops. Evapotranspiration as a function of leaf area index and class A pan evaporation. S pbk Main Reading Room – Doorebos pre held offsite.


According to Villa Nova et al. The following data were collected: The atmospheric pressure was determined by aneroid barograph, and sunshine duration was quantified with a Campbell-Stokes priutt. Agricultural and Forest Meteorology, Amsterdam, v.

Reference evapotranspiration ETo is an essential component for use in water supply planning and irrigation scheduling Snyder, since the crop evapotranspiration ETc is estimated by ETo multiplied by the crop coefficient Kc.

On the other days there were operational difficulties doorenbbos this kind of lysimeter because of high intensity rainfall and wind which resulted in uncertainties and errors as described by Pereira et al. With these methods, the relationship between measured and estimated ETo showed high accuracy and good precision: Table 2 presents the statistical analysis of ETo estimates using different Kp methods.

Food and Agriculture Organization of the United Nations.