Measuring versus estimating net radiation and soil heat flux: Impact on Penman–Monteith reference ET estimates in semiarid regions

Jiménez-Gavilán, Pablo; Berengena, J.; Allen, Richard G.

doi:10.1016/j.agwat.2007.01.014

Cited by 123 publications

(70 citation statements)

References 28 publications

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“…We assumed here that both the soil heat flux and the canopy heat storage are negligible. This assumption is not critical at the daily time step on homogeneous bare soil and short crops [46,47]. Daily latent heat fluxes were divided by the latent heat of vaporization to obtain evapotranspiration in mm·day −1 (more details can be found in [48]).…”

Section: Experimental Datamentioning

confidence: 99%

Impact of Sowing Date on Yield and Water Use Efficiency of Wheat Analyzed through Spatial Modeling and FORMOSAT-2 Images

et al. 2015

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Regional analysis of water use efficiency (WUE) is a relevant method for diagnosing the performance of irrigation systems in water-limited environments. In this study, we investigated the potential of FORMOSAT-2 images to provide spatial estimates of WUE over irrigated wheat crops cultivated within the semi-arid Yaqui Valley, in the northwest of Mexico. FORMOSAT-2 provided us with a unique dataset of 36 images at a high resolution (8 m) encompassing the wheat growing season from November 2007 to May 2008. Time series of green leaf area index were derived from these satellite images and used to calibrate a simple crop/water balance model. The method was applied over an 8 × 8 km 2 irrigated area on up to 530 wheat fields. It allowed us to accurately reproduce the time courses of Leaf Area Index and dry aboveground biomass, as well as evapotranspiration and soil moisture. In a second step, we analyzed the variations of WUE as the ratio of accumulated dry aboveground biomass to seasonal evapotranspiration. Despite the study OPEN ACCESSRemote Sens. 2015, 7 5952 area being rather small and homogeneous (soil, climate), we observed a large range in wheat biomass production, from 5 to 15 t·ha −1 , which was primarily related to the timing of plant emergence. In contrast, the seasonal evapotranspiration only varied from 350 to 450 mm, with no evident link with sowing practices. A significant gain in crop water productivity was found for the fields sown the earliest (maximal WUE around 3.5 kg·m −3 ) compared to those sown the latest (minimal WUE around 1.5 kg·m −3). These results demonstrated the value of the FORMOSAT-2 images to provide spatial estimates of crop production and water consumption. The detailed information provided by such high space and time resolution imaging systems is highly valuable to identify agricultural practices that could enlarge crop water productivity.

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Section: Experimental Datamentioning

confidence: 99%

Impact of Sowing Date on Yield and Water Use Efficiency of Wheat Analyzed through Spatial Modeling and FORMOSAT-2 Images

et al. 2015

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“…Studies comparing estimation methods of ETo in relation to method of Penman-Monteith parameterized by FAO are performed for different regions in Brazil and worldwide, as a way to evaluate efficiency of indirect methods (VESCOVE & TURCO, 2005;GAVILÁN et al, 2007;REIS et al, 2007;PEREIRA et al, 2009;TAGLIAFERRE et al, 2010;FRANÇA NETO et al, 2011;CAVALCANTE JÚNIOR et al, 2011;ALENCAR et al, 2011;PILAU et al, 2012;BORGES JÚNIOR et al, 2012). The results of conducted research varied extremely, since each region present peculiar climate characteristics and the estimation methods of ETo exhibits problems of precision and accuracy, mainly because of the non-adjustment of model coefficients and sensors accuracy (BARROS et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Estimation methods of reference evapotranspiration (ETo) for Uberlândia -MG

Lacerda

Turco

2015

Eng. Agríc.

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ABSTRACT:One approach to verify the adequacy of estimation methods of reference evapotranspiration is the comparison with the Penman-Monteith method, recommended by the United Nations of Food and Agriculture Organization -FAO, as the standard method for estimating ET 0 . This study aimed to compare methods for estimating ET 0 , Makkink (MK), Hargreaves (HG) and Solar Radiation (RS), with Penman-Monteith (PM). For this purpose, we used daily data of global solar radiation, air temperature, relative humidity and wind speed for the year 2010, obtained through the automatic meteorological station, with latitude 18° 91' 66" S, longitude 48° 25' 05" W and altitude of 869m, at the National Institute of Meteorology situated in the Campus of Federal University of Uberlandia -MG, Brazil. Analysis of results for the period were carried out in daily basis, using regression analysis and considering the linear model y = ax, where the dependent variable was the method of Penman-Monteith and the independent, the estimation of ET 0 by evaluated methods. Methodology was used to check the influence of standard deviation of daily ET 0 in comparison of methods. The evaluation indicated that methods of Solar Radiation and PenmanMonteith cannot be compared, yet the method of Hargreaves indicates the most efficient adjustment to estimate ETo.

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“…The Penman-Monteith approach was chosen as the standard method to estimate ETo because it demonstrates that calculated values are rather close to measured grass evapotranspiration at a given site and also points out its superiority in relation to other methods (Cai et al, 2007;Gavilan et al, 2007;Xing et al, 2008). Such a method is based on physical processes and, explicitly incorporates physiological and aerodynamic parameters into it.…”

Section: IImentioning

confidence: 99%

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

Schiebelbein¹,

Pereira²

2018

IJAERS

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Measuring versus estimating net radiation and soil heat flux: Impact on Penman–Monteith reference ET estimates in semiarid regions

Cited by 123 publications

References 28 publications

Impact of Sowing Date on Yield and Water Use Efficiency of Wheat Analyzed through Spatial Modeling and FORMOSAT-2 Images

Impact of Sowing Date on Yield and Water Use Efficiency of Wheat Analyzed through Spatial Modeling and FORMOSAT-2 Images

Estimation methods of reference evapotranspiration (ETo) for Uberlândia -MG

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

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