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Table 2 presents parameters of dual Kc approach for maize ET estimation in 2013. Ze was 0.1 m in this study, recommended by FAO-56 (Allen et al. 1998). Measured maximum hc and LAI were 2.97 m and 3.95 m2/m2, respectively. REW, TEW, and TAW were calibrated using soil property data, with values of 7, 23, and 181 mm, respectively. Greater TEW and TAW may be due to the fact that the soil in the experimental site was sandy loam, leading to a greater soil water content at field capacity (36.2%). According to Allen & Pereira (2009) and Ding et al. (2013), accurate estimation of canopy cover coefficient could be achieved when κ was 0.7.

Table 2

Parameters of dual Kc approach for maize ET estimation in 2013

ParametersValuesUnitsSource
Ze 0.1 Allen et al. (1998)  
Maximum hc 2.97 Measured 
Maximum LAI 3.95 m2/m2 Measured 
REW mm Calibrated 
TEW 23 mm Calibrated 
TAW 181 mm Calibrated 
κ 0.7 – Ding et al. (2013)  
ParametersValuesUnitsSource
Ze 0.1 Allen et al. (1998)  
Maximum hc 2.97 Measured 
Maximum LAI 3.95 m2/m2 Measured 
REW mm Calibrated 
TEW 23 mm Calibrated 
TAW 181 mm Calibrated 
κ 0.7 – Ding et al. (2013)  

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