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Table 5.
The content of heavy metals in the plowing layer of the experimental plot, mg/kg
| Indicators | Plowing layer 0–30 cm | MPC | |
|---|---|---|---|
| Zn | Total forrn | 31.5 | 100 |
| Active form | 6.5 | 23 | |
| Cu | Total forrn | 14.0 | 55 |
| Active form | 3.12 | 3 | |
| Pb | Total forrn | 12.7 | 30 |
| Active form | 2.64 | 6 | |
| Cd | Total forrn | 0.74 | 3 |
| Active form | 0.4 | 0.6 | |
| Ni | Total forrn | 23.8 | 85 |
| Active form | 3.52 | 5 | |
| Hg | Total forrn | 0.017 | 2.1 |
| Active form | - | 0.1 | |
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