| Crop | Parameter | a | b | c |
| Straw | Cost | 25.65 | −0.397 | −0.507 |
| Energy input | 148.00 | −0.692 | −0.464 | |
| CO2 emission | 10.30 | −0.665 | −0.447 | |
| Stover | Cost | 52.40 | −0.679 | −0.654 |
| Energy input | 405.00 | −0.817 | −0.740 | |
| CO2 emission | 28.70 | −0.797 | −0.750 | |
| Switchgrass | Cost | 33.90 | −0.000 | −0.300 |
| Energy input | 302.40 | −0.000 | −0.460 | |
| CO2 emission | 20.73 | −0.000 | −0.460 |