| Sawonjo | Ago-Iwoye | Ajegunle | |||||
| Season | Mean ± Std. Dev | Sig. | Mean ± Std. Dev | Sig. | Mean ± Std. Dev | Sig. | |
| Mn | Rainy | 42.2 ± 2.0 | 0.01 | 44.2 ± 0.8 | 0.00 | 43.1 ± 0.9 | 0.00 |
| Dry | 44.9 ± 0.3 | 40.3 ± 0.4 | 47.6 ± 0.9 | ||||
| Fe | Rainy | 2262 ± 27 | 0.00 | 1907 ± 96 | 0.00 | 1689 ± 90 | 0.00 |
| Dry | 3030 ± 90 | 2007 ± 35 | 1711 ± 10 | ||||
| Pb | Rainy | 29.7 ± 0.7 | 0.00 | 15.9 ± 0.3 | 0.00 | 22.0 ± 0.7 | 0.03 |
| Dry | 32.5 ± 0.8 | 20.0 ± 0.8 | 23.1 ± 0.8 | ||||
| Zn | Rainy | 138 ± 11 | 0.00 | 134 ± 32 | 0.50 | 141 ± 13 | 0.00 |
| Dry | 141.1 ± 0.7 | 143 ± 29 | 144 ± 9 | ||||
| Ni | Rainy | 15.9 ± 0.5 | 0.00 | 17.0 ± 0.8 | 0.00 | 18.7 ± 0.9 | 0.00 |
| Dry | 22.9 ± 0.7 | 20.4 ± 0.8 | 21.4 ± 0.6 | ||||