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Chemical properties of biochar used and soil before the experiment.
| Properties of biochar | Values | Properties of soil | Values |
| pH | 9.42 | pH | 6.04 |
| Nitrogen | 0.74% | Electric conductivity | 1.08 |
| Carbon | 47.14% | Total nitrogen | 0.49 g kg–1 |
| Hydrogen | 1.62% | Total phosphorus | 0.34 g kg–1 |
| Oxygen | 11.85% | Available potassium | 76.24 mg kg–1 |
| Potassium | 18.9% | Soil organic carbon | 4.62 g kg–1 |
| Phosphorus | 0.32% | ||
| Ash | 19.43% |
