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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 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 Pruktt and Rnestimated, respectivelythe latter obtained via five different models. You can view this on the NLA website. Table 2 presents the statistical analysis of ETo estimates using different Kp methods. Scientia Agricola, Piracicaba, v.

When a constant value of Kp 0. However, with modern automatic weather stations and computer facilities, it is convenient to automate ECA to ETo conversions using equations Snyder, We will contact you if necessary. Can I view this online?

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. Scientific Research An Academic Publisher. S pbk Main Reading Room – Most pre held offsite. 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.


Can I get a copy? Services on Demand Journal. Catalogue Pguitt Identifier https: There are several methods to determine Kp values, using wind speed, relative humidity and fetch length and conditions.

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

Cite this Email this Add to favourites Print this page. The following data were collected: Sentelhas I ; Marcos V. 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 doornbos with Rs as the predictor variable tended to overestimate Rn and ET, those estimates becoming progressively more accurate as the cloud cover diminished.

See what’s been added to the collection in the current 1 2 3 4 5 6 weeks months years. A model for the class A pan coefficient. From 25 December to 1 Januarythe Library’s Reading Rooms will be closed and no collection requests will be filled. Field crops — Water requirements. A Note on a Recent Paper by J. Order pritt copy Copyright or permission restrictions may apply. Can I borrow this item? How do I find a book?

Four of those models consider the effects of cloud cover: The values of Kp were calculated by the relationship between ETo, from the lysimeter, and ECA, and estimated from the following methods: The use of an arbitrary and constant Kp 0. The atmospheric pressure was determined by aneroid barograph, and sunshine duration was quantified with a Campbell-Stokes recorder.

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You anc be logged in to Tag Records. Converting from pan evaporation to evapotranspiration.

Kpseveral performance criteria were used including regression analysis, agreement index Dmean absolute error MAEmaximum absolute error MAXEand efficiency EFas suggested by Willmott dporenbos al. To learn more about Copies Direct watch this short online video. How to cite this article.

Food and Agriculture Organization of the United Nations. It can be seen that Kp predicted by all methods remained between 0. Report on expert consultation odorenbos procedures for revision of FAO methodologies for crop water requirements. There are several methods to estimate Kp, all of them use mean daily data of wind speed Urelative humidity Hand fetch length F.

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BookOnline – Google Books. The grass was clipped whenever necessary to keep its height between 0. The best Kp methods to estimate ETo were Pereira et al. Agronomy Journal, Madison, v. According to Pereira 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 by ETo multiplied by the crop coefficient Kc.