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4. The average annual rate of addition referred to in regulation 3(4) shall be ascertained for each of the elements in the sludge table by taking the average amount of that element in the sludge used on that land in the period of ten years ending on the date of such use.
| (1) | (2) | (3) |
|---|---|---|
| Element | Kilograms per hectare per year | Limit of detection (mg/kg of dry matter) |
| Zinc | 15 | 50 |
| Copper | 7.5 | 25 |
| Nickel | 3 | 10 |
| Cadmium | 0.15 | 1 |
| Lead | 15 | 25 |
| Mercury | 0.1 | 0.1 |
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