Table 4.
Effects of different stabilization treatments on NH4NO3 extractability (mg/kg) of Cd and phytoavailability for lettuce on two spiked soils
| Stabilization treatments | Cd | |||
|---|---|---|---|---|
| PKa soil | BAa soil | |||
| NH4NO3 extractability | Phytoavailability | NH4NO3 extractability | Phytoavailability | |
| FMB | 0.339 (0.023)db | 0.00030 (0.000022)cb | 0.187 (0.009)e | 0.00054 (0.000049)b |
| CMB | 0.696 (0.027)c | 0.000166 (0.000009)d | 0.494 (0.038)d | 0.00032 (0.000026)c |
| PLB | 0.655 (0.016)c | 0.000011 (0.000011)e | 0.206 (0.011)e | 0.00019 (0.000007)d |
| PJB | 0.713 (0.012)c | 0.00020 (0.000004)d | 0.940 (0.067)c | 0.00023 (0.000009)d |
| CHB | 4.67 (0.152)a | 0.00031 (0.000044)c | 2.81 (0.314)a | 0.00052 (0.000030)b |
| ES | 0.261 (0.016)de | 0.00053 (0.000029)b | 0.689 (0.031)d | 0.00029 (0.000011)c |
| LI | 0.198 (0.004)e | 0.00029 (0.000011)c | 0.245 (0.012)e | 0.00014 (0.000006)e |
| CON+ | 2.17 (0.029)b | 0.00090 (0.000032)a | 1.39 (0.073)b | 0.00079 (0.000027)a |
FMB faecal matter (faecal cake) biochar, CMB cow manure biochar, PLB poultry litter biochar, PJB Prosopis juliflora pods biochar, CHB Coffee husk biochar, ES eggshell waste, LI lime, CON + spiked control
aPK soil: Silty loam soil; BA soil: Sandy loam soil
bStandard deviation in parentheses (n = 3), values for each soil with different letter within each column are significantly different (P < 0.05)