| Sample | PR | Mean ± SD | Pr > |t| | Sig. |
| BRH | Atrazine | 5.89 ± 0.04 | 0.003 | *** |
| Clomazone | 1.42 ± 0.20 | 0.06 | NS | |
| Desethatz | 0.20 ± 0.11 | 0.24 | NS | |
| Metribuzin | 0.11 ± 0.01 | 0.06 | NS | |
| Metolachlor | 8.21 ± 1.66 | 0.09 | NS | |
| Metalaxyl | 0.04 ± 0.00 | <0.0001 | *** |