Table 1 CaCl2-and DTPA-extractable Pb in soil amended with biochar (mean ± S.E., n = 3).

From: Biochar amendment immobilizes lead in rice paddy soils and reduces its phytoavailability

Biochar added

Tillering stage

pH

Maturity stage

pH

CaCl2-Pb (mg kg−1)

DTPA-Pb (mg kg−1)

WSOC (mg kg−1)

CaCl2-Pb (mg kg−1)

DTPA-Pb (mg kg−1)

WSOC (mg kg−1)

0%

10.04 ± 1.54aa

616.7 ± 19.76ab

321.22 ± 20.70b

5.63 ± 0.24c

35.29 ± 5.49a

750.2 ± 13.39a

180.79 ± 10.63b

5.31 ± 0.27b

2.50%

3.30 ± 0.46b

639.8 ± 14.49a

426.26 ± 16.31ab

6.09 ± 0.06b

12.68 ± 0.83b

709.1 ± 26.82a

166.45 ± 4.28b

5.48 ± 0.10b

5%

0.33 ± 0.24b

508.9 ± 46.02b

599.85 ± 68.03a

6.81 ± 0.31a

2.00 ± 0.16b

625.4 ± 16.87b

270.57 ± 12.02a

6.11 ± 0.13a

  1. *aThe same letter in a column indicates no significant difference at P < 0.05 according to Duncan’s multiple range test.
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