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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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Can I get a copy? The Rnestimated obtained with the fifth model has a relatively high error. Agricultural and Forest Meteorology, Amsterdam, v. Sentelhas I ; Marcos V. Equation for evaporation pan to evapotranspiration conversion. Can I borrow this item? Although there are several methods to estimate Kp, few are the papers that evaluated their precision and accuracy under Brazilian climatic conditions. The atmospheric pressure was determined by aneroid barograph, and sunshine duration was quantified with a Campbell-Stokes recorder.

The fifth was a linear regression model based on Rs.

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

How to cite this article. Statistics for the evaluation and comparison of models. You must be logged in to Tag Records. Browse titles authors subjects uniform titles series callnumbers dewey numbers starting from optional. Journal of Water Resource and ProtectionVol.

The best Kp methods to estimate ETo were Pereira et al. Agronomy Journal, Madison, v. Further information on the Library’s opening hours is available at: In addition to the sensor readings Rnmeasuredfive different models were used in order to obtain the Rnestimated. Details Collect From S 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.


In overcast conditions, the original Brunt model, the FAO model for wet climates, the FAO model for dry climates, the FAO model and the model of linear regression with Rs as the predictor variable tended to overestimate Rn and ET, those estimates becoming progressively more accurate as the cloud cover diminished. BookOnline – Google Books.

Reference evapotranspiration based on Class A pan evaporation. According to Pereira et al. We will contact you if necessary.

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. The grass was clipped whenever necessary to keep its height between 0. It can be seen that Kp predicted by all methods remained between 0. The use of a constant value of Kp showed to be a simple and dkorenbos option to convert ECA into ETo, however, this value must be calibrated and tested for different climatic conditions.

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. A model for the class A pan coefficient.

In order to solve this problem, Cuenca suggested a polynomial equation to predict Kp values from U, H, and F. Cite this Email this Add to favourites Print this page. Catalogue Persistent Identifier https: Collection delivery service resumes on Wednesday 2 January Can I view this online? Class A pan evaporation ECA was also measured in pruitg weather station with a micrometric screw.

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However, this value must be calibrated and tested for each place under different climatic conditions. In the Library Request this item to view in the Library’s reading rooms using your library card. Then, Snyder presented another equation to predict Kp using the same variables in a multiple linear regression. Request this item to view in the Library’s reading rooms using your library card. 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.

You can view this on the NLA website. These criteria are defined as: The use of an arbitrary and constant Kp 0. To learn more about Copies Direct watch this short online video.

Robust quantitative techniques for validating pesticide transport models. Includes bibliographical references p.

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Scientia Agricola, Piracicaba, v. The following data were collected: When these Kp values were used to estimate daily ETo Figure 2a good agreement was observed between estimated and measured values of ETo, especially when the Kp was estimated by Eq. Four of those models consider the effects of cloud cover: There are several methods to estimate Kp, all of them use mean daily andd of wind speed Urelative humidity Hand fetch length F.

Guidelines for predicting crop water requirements.