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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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The same routine was adopted to evaluate ETo estimates with the different Kp values.

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

Agricultural and Forest Meteorology, Amsterdam, v. It can be seen that Kp predicted by all methods remained between 0. Browse titles authors subjects uniform titles series callnumbers dooeenbos numbers abd from optional. From 25 December to 1 Januarythe Library’s Reading Rooms will be closed and no collection requests will be filled. Catalogue Persistent Identifier https: You can view this on the NLA website. Scientia Agricola, Piracicaba, v.

Converting from pan evaporation to evapotranspiration. These criteria are defined as: 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.

Although there are several methods to estimate Kp, few are the papers that evaluated their precision and accuracy under Brazilian climatic conditions. Four of those models consider the effects of cloud cover: 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.


The use of a pruitg value of Kp showed to be a simple and practical option to convert ECA into ETo, however, this value must be calibrated and tested for different climatic conditions. This fixed value is a practical doofenbos simple option to convert ECA into ETo, but this value must be calibrated for each place under 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.

Journal of Water Resource and ProtectionVol. Food and Agriculture Organization of the United Nations. In addition to the sensor readings Rnmeasuredfive different models were used in order to obtain the Rnestimated.

The grass was clipped whenever necessary to keep its height between 0. To learn more about how to request items watch this short online video. The following data were collected: In order to solve this problem, Cuenca suggested a anr equation to predict Kp values from U, H, and F. See what’s been added to the collection in the current 1 2 3 4 5 6 weeks months years.


How to cite this article. Robust quantitative techniques for validating pesticide transport models. To learn more about Copies Direct watch this pruift online video. The atmospheric pressure was determined by aneroid barograph, and sunshine duration puitt quantified with a Campbell-Stokes recorder. The Rnestimated obtained with the fifth model has a relatively high error.

Field crops — Water requirements. Members of Aboriginal, Torres Strait Islander and Maori communities are advised that this catalogue contains names and images of deceased people.

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. Includes bibliographical references p. According to Pereira et al.

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There are several methods to estimate Kp, all of them use mean daily data of wind speed Urelative humidity Hand fetch length F. The original Brunt model and FAO model for wet climates performed more poorly than anv the other models in estimating the Rn and ET0.

This paper analyses the following methods to estimate Kp values: