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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Class Anf pan evaporation ECA was also measured in the weather station with a micrometric screw. This fixed value is a practical and simple option to convert ECA into ETo, but this value must be calibrated for each place under different climatic conditions. Revista Brasileira de Agrometeorologia, Santa Maria, v.

A Note on a Recent Paper by J.

How do I find a book? Journal of Water Resource and ProtectionVol. With these methods, the relationship between measured and estimated ETo showed high accuracy and good precision: All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. 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.

Operational estimates of reference evapotranspiration. Report on expert consultation on procedures for revision of FAO methodologies for crop water requirements. Four of those models consider the effects of cloud cover: To learn more about Copies Direct watch this short online video. From 25 December to 1 Januarythe Library’s Reading Rooms will be closed and no collection requests will be filled.


National Library of Australia. The estimated values of Kp and the observed Kp, obtained from the relationship between ETo measured in a weighing lysimeter and ECA measured in a class A pan, were compared by regression analysis.

On the other days there were operational difficulties with this kind of lysimeter because of high intensity rainfall and wind which resulted in uncertainties and errors as described by Pereira et al. The grass was clipped whenever necessary to keep its height between 0.

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Can I borrow this item? Reference evapotranspiration ETo was measured with an automatic weighing lysimeter 0. The best ETo estimates were obtained when Kp values obtained by the Pereira’s and Cuenca’s methods were used. Services on Demand Journal. Journal of Geophysical Research, Ottawa, v.

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

You can view this on the NLA website. Can I view this online? The following data were collected: A model for the class A pan coefficient. According to Pereira et al. Food and Agriculture Organization of the United Nations. Class A pan coefficients Kp to estimate daily reference evapotranspiration ETo.

This fixed value is a simple and practical option to convert ECA in ETo, without the need of weather doorebos as wind speed, relative humidity and temperature. According to Villa Nova et al. Reference evapotranspiration ETo is an essential component for use in water supply planning and irrigation scheduling Snyder, since the crop evapotranspiration ETc is estimated doofenbos ETo multiplied by the crop coefficient Kc.


These criteria are defined as: The Rnestimated obtained with the fifth model has a relatively high error. In the Library Request this item to view in the Library’s reading rooms using your library card.

You must be logged in to Tag Records. Field crops — Water requirements. Evapotranspiration as a function of leaf area index and class A pan evaporation.

Further information on the Library’s opening hours is available at: This paper analyses the following methods to estimate Kp values: BookOnline – Google Books. However, this value must be calibrated and tested for each place under different climatic conditions.

Members of Aboriginal, Torres Strait Islander and Maori communities are advised that this catalogue contains names and images of deceased people. There are several methods to determine Kp values, using wind speed, relative humidity and fetch length and conditions. Scientia Agricola, Piracicaba, v. Guidelines for predicting crop water requirements.

It can be seen that Kp predicted by all methods remained between 0. 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. Statistics for the evaluation and comparison of models. See what’s been added to the collection in the current 1 2 3 4 5 6 weeks months years.

Agronomy Journal, Madison, v.

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