scholarly journals Performance of Reference Evapotranspiration Estimation Methods at the Southern Paraná, Brazil

2018 ◽  
Vol 5 (6) ◽  
pp. 182-190
Author(s):  
Luis Miguel Schiebelbein ◽  
André Belmont Pereira
Keyword(s):  
Reference Evapotranspiration ◽  
Estimation Methods ◽  
Evapotranspiration Estimation

scholarly journals Evapotranspiração da cultura da cebola

2015 ◽  
Vol 10 (4) ◽  
pp. 58
Author(s):  
G. M. Oliveira ◽  
M. W. Silva ◽  
M. N. Daamen ◽  
E. C. S. Cavalcante ◽  
M. M. V. B. R. Leitão
Keyword(s):  
Social Sciences ◽  
Reference Evapotranspiration ◽  
Irrigation System ◽  
The State ◽  
Estimation Methods ◽  
Crop Evapotranspiration ◽  
Experimental Field ◽  
Evapotranspiration Estimation ◽  
Made In

<p><span>A determinação da quantidade de água necessária para as culturas é um dos principais fatores para o correto planejamento, dimensionamento e manejo de qualquer sistema de irrigação. O presente trabalho teve como objetivo, comparar medida da evapotranspiração da cultura (ETc) da cebola com estimativa obtida a partir da evapotranspiração de referência (ETo) determinada por diferentes métodos e Kc proposto na literatura. O experimento foi conduzido no campo experimental do Departamento de Tecnologia e Ciências Sociais da Universidade do Estado da Bahia - UNEB, em Juazeiro, no período de junho a setembro de 2011. As medidas da ETc foram obtidas em evapotranspirômetros e as estimativas, a partir de ETo determinada pelos métodos: Penman-Monteith (padrão FAO), Penman-Monteith modificado por Villa Nova et al. (2004), Hargreaves &amp; Samani, Makkink e Jensen &amp; Haise e Kc proposto por Marouelli et al. (2005), para a cultura da cebola.<strong> </strong>É fundamental a avaliação de métodos de estimativa da evapotranspiração de referência antes de sua aplicação, pois erros consideráveis podem ser cometidos na determinação da quantidade de água a ser aplicada a uma cultura, o que repercutirá certamente, na produtividade.</span></p><p align="center"><strong><em>Evapotranspiration crop onion</em></strong></p><p><strong>Abstract</strong><strong>: </strong>The determination of the amount of water needed for crops is a major factor for the correct planning, sizing and management of any irrigation system. This study aimed to compare measure of crop evapotranspiration (ETc) onion with estimates obtained from the reference evapotranspiration (ETo) determined by different methods and Kc proposed in the literature. The experiment was conducted in the experimental field of the Department of Technology and Social Sciences, University of the State of Bahia, in Juazeiro, from June to September 2011. The ETc measurements were obtained in evapotranspirometers and estimates, from ETo determined by the methods: Penman-Monteith (FAO standard), Penman-Monteith modified by Villa Nova et al. (2004), Hargreaves &amp; Samani, Makkink and Jensen &amp; Haise and Kc proposed by Marouelli et al. (2005), for the cultivation of onion. It is critical to evaluation of reference evapotranspiration estimation methods before their application because considerable mistakes can be made in determining the amount of water to be applied to a culture, which resonate certainly in productivity.</p><p><span><br /></span></p>

scholarly journals Evaluation of Evapotranspiration Estimation Models for Junagadh City of Gujarat

2016 ◽  
Vol 11 (2) ◽  
pp. 619-630
Author(s):  
H. H Mashru ◽  
D. K Dwivedi
Keyword(s):  
Performance Evaluation ◽  
Reference Evapotranspiration ◽  
Estimation Method ◽  
Irrigation Scheduling ◽  
Alternative Methods ◽  
Estimation Methods ◽  
Economic Returns ◽  
Field Crops ◽  
Evapotranspiration Estimation ◽  
Estimation Models

Estimation of Evapotranspiration is important for determining the agro-climatic potential of a particular region, water requirement of field crops, irrigation scheduling and suitability of crops or varieties, which can be grown successfully with the best economic returns and therefore numerous models have been developed for determining evapotranspiration. The performance evaluation of commonly used reference evapotranspiration (ET0) estimation methods like FAO 56 Penman-Monteith, Samani and Hargreaves, Makkink, Blaney Criddle, Jensen-Haise, Priestly-Taylor, FAO 24 radiation and Modified Penman Monteith method based on their accuracy of estimation has been undertaken in this study. The inter-relationship between FAO-56 Penman-Monteith method and other reference evapotranspiration (ET0) estimation method is also determined in this study. The results showed that Blaney Criddle method, Modified Penman method, Jensen-Haise method and Priestly-Taylor method are the alternative methods to Penman-Monteith method for better estimate of ET0 for the Junagadh city of Gujarat, India.

scholarly journals Comparison of reference evapotranspiration estimation methods, on days with and without precipitation

2021 ◽  
pp. 52-61
Author(s):  
Elton Ferreira Lima ◽  
Rafael Guimarães Silva Moraes ◽  
Jossimara Ferreira Damascena ◽  
Edson Araújo de Amorim ◽  
Layane Cruz dos Santos ◽  
...  
Keyword(s):  
Reference Evapotranspiration ◽  
Linear Regression Analysis ◽  
Global Solar Radiation ◽  
Dew Point ◽  
Estimation Methods ◽  
Accurate Estimation ◽  
Daily Data ◽  
Relative Air Humidity ◽  
Evapotranspiration Estimation ◽  
Maximum Air Temperature

Water is gradually becoming scarcer and more expensive. Therefore, any means that aims at a more efficient use of this substance in the most diverse sectors, becomes essential. In this context, the accurate estimation of evapotranspiration is of fundamental importance. With this in mind, the objective of this work was to compare the performance of different methodologies for estimating reference evapotranspiration in relation to the FAO Penman-Monteith method on days with and without precipitation in the region of Cambará do Sul/RS. To achieve this goal, daily data on maximum air temperature (°C), minimum temperature (°C), relative air humidity (%), dew point temperature (°C), wind speed at 2 m high (m s-1), atmospheric pressure (hPa) and global solar radiation (MJ m-2 d-1), were acquired from the automatic weather station located in Cambará do Sul/RS and divided into two sets (days with and without precipitation ). The comparison between the different methodologies and the standard method, for each period mentioned above, took place through a simple linear regression analysis to obtain the regression coefficients a and b and the determination coefficient. Subsequently, Pearson's correlation coefficient, root of the mean square of the error, Willmott index and the Camargo and Sentelhas index were calculated . For the municipality of Cambará do Sul/RS to replace the Penman-Monteith method, we recommend the use of the Penman and Makkink methods, which presented satisfactory performance in all periods analyzed.

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