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| Magnesium Sulphate | Local | Import | Micronutrients |
| Composition as percent by weight | |||
| Magnesium as Mg | Minimum | 9.50% | |
| Sulphate Sulphur (as S) | Minimum | 12% | |
| Matter insoluble in water | Maximum | 1% | |
| pH (5% Solution) | 5.8-8% | ||
| Lead (as Pb) | Maximum | 0.00% | |
| Cadmium (as Cd) | Maximum | 0.00% | |
| Arsenic (as As) | Maximum | 0.01% |