Comparison of actual evapotranspiration of irrigated maize in a sub-humid region using four different canopy resistance based approaches

•Evapotranspiration was estimated using four different canopy resistance approaches.•Comparison was made between different canopy resistance approaches to soil water balance.•Todorovic approach was found the best out of all the four approaches used for estimation of ET.•Jarvis approach could be an a...

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Bibliographic Details
Published in:Agricultural water management 2018-04, Vol.202, p.156-165
Main Authors: Srivastava, R.K., Panda, R.K., Chakraborty, A., Halder, D.
Format: Article
Language:English
Subjects:
Aerodynamic
Canopy resistance
Evapotranspiration
Micrometeorology
Water balance
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Summary:•Evapotranspiration was estimated using four different canopy resistance approaches.•Comparison was made between different canopy resistance approaches to soil water balance.•Todorovic approach was found the best out of all the four approaches used for estimation of ET.•Jarvis approach could be an alternative for irrigated maize in a sub humid region. The single layer Penman-Monteith (PM) method is widely used method for the estimation of crop evapotranspiration (ETc). The accuracy of ETc estimate relies upon the quality of input weather data and capacity to approach adequately canopy (rc) and aerodynamic resistance (ra). In this study, the PM method was used to estimate daily crop evapotranspiration of irrigated maize for the years 2013 and 2014 in a sub-humid region. Four different approaches (Monteith, Katerji-Perrier, Todorovic, and Jarvis) were used to estimate canopy resistance and, then after, crop evapotranspiration by PM equation were evaluated. The comparison was made to daily crop evapotranspiration obtained from the soil water balance (SWB) and soil water content variation measured by time domain reflectometry (TDR). The cumulative crop evapotranspiration of SWB, Monteith, Katerji-Perrier, Todorovic and Jarvis approach was respectively, 260.4, 266.8, 252.8, 263.4, 256 mm for the year 2013, and 250.5, 257.7, 240.6, 251.8, 247.6 mm for the year 2014. The comparison of results and the statistical analysis confirmed that Todorovic and Jarvis approach gave reliable values, while the Katerji-Perrier approach could be used as an alternative method.
ISSN:0378-3774
1873-2283
DOI:10.1016/j.agwat.2018.02.021