Table 4: Calibration of plant growth parameters.

Growth parameterSWAT rangeCalibrating values
All cropsCornCottonSoybeans

LAI0.500–10.0006.0004.0003.000
LEC0.000–2.0000.6500.6500.450
RUE10.000–90.00039.00015.00025.000
HVSTI0.010–1.2500.4890.1280.194

Observed yield [ ] (t ha−1)Average 1990–20106.0880.7661.874
Simulated yield [ ] (t ha−1)Average 1990–20106.0920.7521.908
BiasAverage 1990–2010+0.06%−1.84%+1.76%

LAI: maximum leaf area index (m2/m2); LEC: light extinction coefficient; RUE: radiation use efficiency (kg m2/ha MJ); HVSTI: harvest index (kg ha/kg ha). Bias is calculated as ( )/ .