The Impact of US Biofuels Policy on Agricultural Production and Nitrogen Loads in Alabama
Table 4
Calibration of plant growth parameters.
Growth parameter
SWAT range
Calibrating values
All crops
Corn
Cotton
Soybeans
LAI
0.500–10.000
6.000
4.000
3.000
LEC
0.000–2.000
0.650
0.650
0.450
RUE
10.000–90.000
39.000
15.000
25.000
HVSTI
0.010–1.250
0.489
0.128
0.194
Observed yield [] (t ha−1)
Average 1990–2010
6.088
0.766
1.874
Simulated yield [] (t ha−1)
Average 1990–2010
6.092
0.752
1.908
Bias
Average 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 ()/.