Table 1 Basic physical and chemical properties of the test soils and biochar.
Property | Pot expt soil | Field expt soil | Rice husk biochar | Limestone |
|---|---|---|---|---|
pH | 6.21 | 5.98 | 8.32 | 8.6 |
Organic matter g/kg | 31.36 | 31.54 | – | – |
Available N (mg/kg) | 299.12 | 158.36 | 17.45 | – |
Available P (mg/kg) | 44.86 | 81.87 | 26.85 | – |
Available K (mg/kg) | 226 | 348 | 12.01 | – |
Total Cd (mg/kg) | 0.23 | 0.64 | No detected | No detected |
Available Cd (mg/kg) | 0.06 | 0.17 | No detected | No detected |
Total C (%) | – | – | 47.5 | – |
Total N (%) | – | – | 0.57 | – |
Total H (%) | – | – | 2.78 | – |
Total O (%) | – | – | 13.2 | – |
Surface area (m2g−1) | – | – | 29.1 | – |
Ash (%) | – | – | 30 | – |
