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| No | Amendment | Dosage (weight ratio) | Pricea ($ per ton) | Cost ($ per hm2) | Reference |
|---|---|---|---|---|---|
| 1 | Limestone | 0.1% | 140 | 420 | 16 |
| 2 | Sepiolite | 0.5% | 300 | 4500 | 11 and 46 |
| 3 | Palygorskite | 0.5% | 400 | 6000 | 11 |
| 4 | Hydroxyapatite | 0.1% | 11 000 | 33 000 | 19 |
| 5 | Biochar | 0.1% | 450 | 1350 | 16 |
| 6 | Composite silicate | 0.2% | 100 | 600 | This study |
Estimated by market survey in 2019, including the cost of materials without the cost of transport or operation.
