Table 4 Effects of different stabilization treatments on NH₄NO₃ extractability (mg/kg) of Cd and phytoavailability for lettuce on two spiked soils

0.339 (0.023)d^b

0.00030 (0.000022)c^b

0.187 (0.009)e

0.00054 (0.000049)b

0.696 (0.027)c

0.000166 (0.000009)d

0.494 (0.038)d

0.00032 (0.000026)c

0.655 (0.016)c

0.000011 (0.000011)e

0.206 (0.011)e

0.00019 (0.000007)d

0.713 (0.012)c

0.00020 (0.000004)d

0.940 (0.067)c

0.00023 (0.000009)d

4.67 (0.152)a

0.00031 (0.000044)c

2.81 (0.314)a

0.00052 (0.000030)b

0.261 (0.016)de

0.00053 (0.000029)b

0.689 (0.031)d

0.00029 (0.000011)c

0.198 (0.004)e

0.00029 (0.000011)c

0.245 (0.012)e

0.00014 (0.000006)e

2.17 (0.029)b

0.00090 (0.000032)a

1.39 (0.073)b

0.00079 (0.000027)a