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Based on the mechanical composition and bulk density of the soil, the soil hydraulic parameters such as θr, θs, α, n and Ks were determined first by using the neural network prediction function in HYDRUS-1D. The measured data including the soil water storage in the 0–60 cm layer (the main distribution zone of the root system for winter wheat) and daily ETgw in 2005 were used to manually calibrate the parameters, and the measured data in 2008 were used for validation. The calibrated parameters are shown in Table 5.

Table 5

Calibration result of soil hydraulic parameters

Soil layer (m)θr (cm3 cm−3)θs (cm3 cm−3)Α (1 cm−1)nKs (cm d−1)l
0–0.2 0.051 0.449 0.032 1.55 50 0.5 
0.2–1.5 0.044 0.399 0.010 1.20 25 0.5 
Soil layer (m)θr (cm3 cm−3)θs (cm3 cm−3)Α (1 cm−1)nKs (cm d−1)l
0–0.2 0.051 0.449 0.032 1.55 50 0.5 
0.2–1.5 0.044 0.399 0.010 1.20 25 0.5 

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