| As | Cd | Co | Cr | Cu | Hg | Mn | Ni | Pb | Sb | Se | Zn |
| μg/.g | |||||||||||
Off-season agriculture | ||||||||||||
Mean | <1 | <5 | <10 | 97.4 | 20.5 | <0.03 | 306.2 | <10 | 12.4 | <1 | <1 | 6.8 |
S.E. |
|
|
| 22.7 | 1.5 |
| 40.1 |
| 2.0 |
|
| 0.4 |
Min. | <1 | <5 | <10 | 57.5 | 15.8 | <0.03 | 213.8 | <10 | 6.1 | <1 | <1 | 6.5 |
Max. | <1 | <5 | <10 | 202.0 | 25.5 | <0.03 | 435.1 | <10 | 20.1 | <1 | <1 | 7.0 |
Pluvial agriculture | ||||||||||||
Mean | 1.12 | <5 | <10 | 106.5 | 13.5 | 1.17 | 582.5 | 10 | 3.5 | <1 | <1 | 31.8 |
S.E. | 0.03 |
|
| 21.1 | 1.5 | 0.03 | 85.1 |
| 0.3 |
|
| 3.5 |
Min. | 1.00 | <5 | <10 | 44.4 | 7.3 | 1.14 | 210.3 | <10 | 3.3 | <1 | <1 | 20.3 |
Max. | 1.00 | <5 | <10 | 193.0 | 18.6 | 1.20 | 810.2 | 10 | 3.7 | <1 | <1 | 40.5 |
AFNOR U44-41 | 100 | 2 | 30 | 150 | 100 | 1 | - | 50 | 100 | - | - | 300 |