| SL4 | SL5 |
---|---|---|
Physicochemical parameters | ||
 pH | 6.87 ± 0.28 | 6.60 ± 0.06 |
 Moisture (%) | 6.75 ± 0.01 | 4.32 ± 0.01 |
 Total organic matter (%) | 73.21 ± 0.21 | 64.79 ± 1.90 |
 Total nitrogen (%) | 53.48 ± 0.69 | 36.08 ± 2.13 |
 Phosphorus (mg/kg) | 29.41 ± 0.82 | 22.15 ± 1.39 |
 Potassium (mg/kg) | 17.880 ± 0.002 | 12.160 ± 0.003 |
Heavy metals content | ||
 Lead (mg/kg) | 0.020 ± 0.001 | ND |
 Chromium (mg/kg) | 5.910 ± 0.003 | 3.580 ± 0.002 |
 Cadmium (mg/kg) | 0.150 ± 0.001 | 62.800 ± 0.002 |
 Zinc (mg/kg) | 14.080 ± 0.003 | 7.760 ± 0.004 |
 Iron (mg/kg) | 13.940 ± 0.003 | 7.230 ± 0.005 |
 Copper (mg/kg) | 12.580 ± 0.001 | 8.220 ± 0.004 |
 Selenium (mg/kg) | 0.006 ± 0.001 | ND |