Table 2.
Elemental concentration of fertilizers (superphosphate, potassium chloride, ammonium nitrate) and biochar (n.d. denotes to “not determined”).
| Element | Soil | Superphosphate | Potassium chloride | Ammonium nitrate | Biochar |
|---|---|---|---|---|---|
| (%) | |||||
| Si | 30.3 | 0.327 | 0.334 | 0.0442 | 0.0196 |
| P | 0.104 | 6.73 | 0.56 | 0.106 | 0.0191 |
| C | 3.47 | 1.82 | 7.98 | 3.61 | 92.6 |
| N | n.d. | n.d. | n.d. | 84.1 | 7.17 |
| S | 0.348 | 15.5 | 0.465 | 0.328 | 0.0061 |
| Cl | 0.0102 | 0.0842 | 23.2 | 0.0658 | 0.0029 |
| Br | n.d. | n.d. | 0.0938 | n.d. | n.d. |
| F | n.d. | 2.51 | n.d. | 0.37 | n.d. |
| Na | 0.378 | 0.253 | 1.39 | 0.0245 | n.d. |
| K | 3.35 | 0.199 | 34.3 | 0.0131 | 0.0579 |
| Ca | 0.731 | 24.6 | 0.412 | 0.132 | 0.0867 |
| Mg | 0.697 | 0.106 | 0.0599 | 0.481 | 0.0337 |
| Ba | 0.0584 | 0.0494 | n.d. | 0.163 | n.d. |
| Al | 6.11 | 0.0516 | 0.0817 | 0.0202 | 0.0082 |
| in ug/g | |||||
| Fe | 16 200 | 2000 | 1810 | 114 | 33 |
| Zn | 42 | 267 | n.d. | n.d. | 79400 |
| Cr | 56 | 162 | n.d. | n.d. | n.d. |
| Ni | 31 | 52 | n.d. | n.d. | 82900 |
| Cu | n.d. | 29 | n.d. | n.d. | n.d. |
| Zr | 308 | n.d. | n.d. | n.d. | n.d. |
| Sr | 96 | 1580 | 91 | n.d. | n.d. |
| Y | 11 | 51 | n.d. | n.d. | n.d. |