Table 2.
Soil properties after a six-month greenhouse trial with lodgepole pine-derived biochar and soil from areas affected by the Church's Park fire, Colorado. Data are means and standard error in parentheses (n = 6 per treatment).
| Biochar | Watering regime | p values | |||||
|---|---|---|---|---|---|---|---|
| t/ha | Dry | Wet | Biochar | Water | Char × water | ||
| Gravimetric water content | (%) | 0 | 12.1 (0.7) | 20.5 (0.6) | <0.001 | <0.001 | <0.001 |
| 20 | 21.7 (1.0) | 23.0 (0.9) | |||||
| pHw | — | 0 | 5.6 (0.05) | 5.6 (0.05) | <0.001 | 0.570 | 0.731 |
| 20 | 5.9 (0.06) | 6.0 (0.08) | |||||
| pHsalt | — | 0 | 4.5 (0.07) | 4.6 (0.03) | <0.001 | 0.128 | 0.401 |
| 20 | 4.9 (0.04) | 5.0 (0.06) | |||||
| NO3-N | (mg/L) | 0 | 1.8 (0.3) | 0.8 (0.2) | <0.001 | 0.002 | 0.297 |
| 20 | 7.9 (0.7) | 5.8 (0.5) | |||||
| NH4-N | (mg/L) | 0 | 0.3 (0.1) | 0.5 (0.1) | 0.524 | 0.231 | 0.441 |
| 20 | 0.3 (0.1) | 0.3 (0.1) | |||||
| P | (mg/L) | 0 | 36.0 (1.3) | 38.2 (1.0) | <0.001 | 0.520 | 0.026 |
| 20 | 49.5 (0.6) | 45.7 (1.9) | |||||
| K | (mg/L) | 0 | 23.6 (1.2) | 22.5 (0.9) | <0.001 | 0.009 | 0.115 |
| 20 | 30.5 (0.9) | 26.2 (0.9) | |||||
| Mg | (mg/L) | 0 | 16.6 (1.6) | 16.6 (1.7) | 0.253 | 0.883 | 0.888 |
| 20 | 18.7 (1.6) | 18.2 (1.5) | |||||
| Ca | (mg/L) | 0 | 99.5 (4.0) | 95.7 (3.7) | 0.001 | 0.166 | 0.785 |
| 20 | 112.2 (2.7) | 106.6 (2.8) | |||||