| Probability level | Standard deviation error | Un-standardized coefficients | Standardized coefficients | Model |
| 0.00 | 83.77 | −1676.61 | - | Constant |
| 0.00 | 0.015 | 0.99 | 1.35 | Straw |
| 0.00 | 0.013 | 1.01 | 2.10 | Total dry matter |
| 0.00 | 0.020 | 1.03 | 1.53 | Grain yield |