| Herbicide | Estimate | Standard error | Pr > |t| | |
| IFT + MTZ | GLY | |||
| 0 | 0 | 0.000 | 0.016 | 1 |
| 1 | 1 | −0.378 | 0.033 | <0.0001 |
| 1 | 2 | −0.601 | 0.033 | <0.0001 |
| 1 | 3 | −0.678 | 0.033 | <0.0001 |
| 1 | 4 | −0.714 | 0.033 | <0.0001 |
| 1 | 5 | −0.900 | 0.033 | <0.0001 |
| 1 | 6 | −0.968 | 0.033 | <0.0001 |
| 2 | 1 | −0.389 | 0.033 | <0.0001 |
| 2 | 2 | −0.601 | 0.033 | <0.0001 |
| 2 | 3 | −0.695 | 0.033 | <0.0001 |
| 2 | 4 | −0.730 | 0.033 | <0.0001 |
| 2 | 5 | −0.900 | 0.033 | <0.0001 |
| 2 | 6 | −0.979 | 0.033 | <0.0001 |
| 3 | 1 | −0.389 | 0.033 | <0.0001 |
| 3 | 2 | −0.601 | 0.033 | <0.0001 |
| 3 | 3 | −0.695 | 0.033 | <0.0001 |
| 3 | 4 | −0.730 | 0.033 | <0.0001 |
| 3 | 5 | −0.905 | 0.033 | <0.0001 |
| 3 | 6 | −0.979 | 0.033 | <0.0001 |
| 4 | 1 | −0.394 | 0.033 | <0.0001 |
| 4 | 2 | −0.601 | 0.033 | <0.0001 |
| 4 | 3 | −0.695 | 0.033 | <0.0001 |
| 4 | 4 | −0.730 | 0.033 | <0.0001 |
| 4 | 5 | −0.900 | 0.033 | <0.0001 |
| 4 | 6 | −0.973 | 0.033 | <0.0001 |
| 5 | 1 | −0.389 | 0.033 | <0.0001 |
| 5 | 2 | −0.601 | 0.033 | <0.0001 |
| 5 | 3 | −0.695 | 0.033 | <0.0001 |
| 5 | 4 | −0.735 | 0.033 | <0.0001 |
| 5 | 5 | −0.900 | 0.033 | <0.0001 |
| 5 | 6 | −0.994 | 0.033 | <0.0001 |
| 6 | 1 | −0.389 | 0.033 | <0.0001 |
| 6 | 2 | −0.601 | 0.033 | <0.0001 |
| 6 | 3 | −0.695 | 0.033 | <0.0001 |
| 6 | 4 | −0.730 | 0.033 | <0.0001 |
| 6 | 5 | −0.900 | 0.033 | <0.0001 |
| 6 | 6 | −0.979 | 0.033 | <0.0001 |