Reference evapotranspiration estimates based on minimum meteorological variable requirements of historical weather data

Neto, Antônio José Steidle; Júnior, João C. F. Borges; Andrade, Cristiano Alberto de; Lopes, Darci Clementino; Nascimento, P. T.

doi:10.4067/s0718-58392015000400014

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…It can be shown that the model constructed in this study can better estimate the watermelon ET under the conditions of sub-membrane drip irrigation in the Hexi Oasis by using LAI and meteorological factors. ET 0 is a critical parameter for calculating crop water requirements and irrigation management (Ahmad et al, 2017;Kadam et al, 2021), and the ET 0 calculated based on the P-M equation is directly affected by the local climate (Neto et al, 2015;Borges and Pinheiro, 2019). In this study, the average ET 0 values during the watermelon growing season were found to be 4.15 mm (2020) and 4.33 mm (2021), with the relatively smallest ET 0 at MS.…”

Section: Et Estimation Model and Error Analysismentioning

confidence: 67%

Crop coefficient determination and evapotranspiration estimation of watermelon under water deficit in a cold and arid environment

Zhang,

Wang,

et al. 2023

Front. Plant Sci.

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To investigate the evapotranspiration and crop coefficient of oasis watermelon under water deficit (WD), mild (60%–70% field capacity, FC)and moderate (50%–60% FC) WD levels were set up at the various growth stages of watermelon, including seedling stage (SS), vine stage (VS), flowering and fruiting stage (FS), expansion stage (ES), and maturity stage (MS), with adequate water supply (70%–80% FC) during the growing season as a control. A two-year (2020-2021) field trial was carried out in the Hexi oasis area of China to explore the effect of WD on watermelon evapotranspiration characteristics and crop coefficient under sub-membrane drip irrigation. The results indicated that the daily reference crop evapotranspiration showed a sawtooth fluctuation which was extremely significantly and positively correlated with temperature, sunshine hours, and wind speed. The water consumption during the entire growing season of watermelon varied from 281–323 mm (2020) and 290–334 mm (2021), among which the phasic evapotranspiration valued the maximum during ES, accounting for 37.85% (2020) and 38.94% (2021) in total, followed in the order of VS, SS, MS, and FS. The evapotranspiration intensity of watermelon increased rapidly from SS to VS, reaching the maximum with 5.82 mm·d-1 at ES, after which it gradually decreased. The crop coefficient at SS, VS, FS, ES, and MS varied from 0.400 to 0.477, from 0.550 to 0.771, from 0.824 to 1.168, from 0.910 to 1.247, and from 0.541 to 0.803, respectively. Any period of WD reduced the crop coefficient and evapotranspiration intensity of watermelon at that stage. And then the relationship between LAI and crop coefficient can be characterized better by an exponential regression, thereby establishing a model for estimating the evapotranspiration of watermelon with a Nash efficiency coefficient of 0.9 or more. Hence, the water demand characteristics of oasis watermelon differ significantly during different growth stages, and reasonable irrigation and water control management measures need to be conducted in conjunction with the water requirements features of each growth stage. Also, this work aims to provide a theoretical basis for the irrigation management of watermelon under sub-membrane drip irrigation in desert oases of cold and arid environments.

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Section: Et Estimation Model and Error Analysismentioning

confidence: 67%

Crop coefficient determination and evapotranspiration estimation of watermelon under water deficit in a cold and arid environment

Zhang,

Wang,

et al. 2023

Front. Plant Sci.

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“…As in the HS method, radiation is also required at the "top" of the atmosphere, whose variation is defined based on the day of the year and latitude. In the conception of method, it was taken as the basis Borges Junior model for calculation of solar radiation, proposed in Steidle Neto et al (2015), adapting to obtain the ET 0 , having the following general equation:…”

Section: Estimation Of Reference Evapotranspiration Etmentioning

confidence: 99%

Reference evapotranspiration based on temperature in Minas Gerais state, Brazil

et al. 2019

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In the last decades, the areas of irrigated crops in the state of Minas Gerais have grown considerably, contributing to increase agricultural production in the country. Among the techniques of irrigation management, the determination of the water consumption by the plants is based on the reference evapotranspiration (ET0), the objective of this work was to evaluate and calibrate the Hargreaves-Samani (HS) method and a Proposed Method (MP) against the standard Penman-Monteith-FAO method (PM-FAO) for the state of Minas Gerais. For that, data from 52 conventional meteorological stations of the National Institute of Meteorology (INMET) were used. ET0 was estimated by the methods cited including the Hargreaves-Samani calibrated method (HScal) based on the mean absolute error (MAE). The analysis of the methods was carried out using the following statistical indicators: root mean square error (RMSE), systematic root mean square error (RMSEs), unsystematic root mean square error (RMSEun), the proportions of systematic and unsystematic mean square error, Willmott’s concordance index (d), confidence index (C) and Pearson correlation coefficient (r). It was verified that after the calibration, the HScal method obtained a superior performance to the original HS method in all the studied stations. It was also observed a superior MP performance with respect to the HScal method, in all stations studied.

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“…With great importance for agricultural and urban planning, irrigation managing, regional water balance studies, and agroclimatic zoning (Steidle Neto et al, 2015), evapotranspiration is one of the variables affected by the atmospheric aerosol presence due to changes in the global solar radiation on earth surface. Some observational studies have been attempted to evaluate the aerosol direct effects on the latent heat flux at site levels (Murthy et al, 2014;Steiner et al, 2013;Wang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Influence of Atmospheric Aerosols on Evapotranspiration over a Semiarid Region in Northeast Brazil

Neto

Lopes

2018

Rev. bras. meteorol.

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The knowledge of atmospheric aerosol characteristics at regional and local scales, their temporal changes and interrelations with meteorological variables are of great importance because can modify the global radiative energy balance. This study was carried out to evaluate the influence of aerosols on evapotranspiration over a semiarid region in Northeast Brazil. Aerosol optical depth, global solar radiation, air temperature, air relative humidity, and wind speed were measured in the Research National Center of Semiarid, located at Petrolina, Pernambuco State, Brazil, along two consecutive years. A multivariate model was calibrated and validated for estimating the global solar radiation (Rglobal) based on the aerosol optical depths (AOD) and extraterrestrial solar radiation (R0). Estimates of the reference evapotranspiration (ET0) were obtained by using the FAO standard Penman-Monteith method. Results confirmed that larger aerosol optical depth tends to decrease both Rglobal and ET0. Otherwise, ticker aerosol optical depth tends to absorb less radiation, increasing the ET0. For the semiarid region in Northeast Brazil, most of ET0 deviations were smaller than ±4%. However, higher deviations were also observed, contributing jointly to around 30%, which may result in relevant consequences on the irrigation management, water balance, agroclimatic zoning, among other activities based on the ET0 estimates.

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Reference evapotranspiration estimates based on minimum meteorological variable requirements of historical weather data

Cited by 11 publications

References 25 publications

Crop coefficient determination and evapotranspiration estimation of watermelon under water deficit in a cold and arid environment

Crop coefficient determination and evapotranspiration estimation of watermelon under water deficit in a cold and arid environment

Reference evapotranspiration based on temperature in Minas Gerais state, Brazil

Influence of Atmospheric Aerosols on Evapotranspiration over a Semiarid Region in Northeast Brazil

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