Table 4 Soil cd content (mg kg−1) in the fractions of G1 and G3 derived from two-first order kinetics model (mg kg−1) as affected by biochars and soil textural classes.

From: Mechanisms of Cd immobilization in contaminated calcareous soils with different textural classes treated by acid- and base-modified biochars

 

*Cl

R

RA

RB

S

SA

SB

Main effects

G1

H

32.53 c

31.94 d

31.53 e

31.50 ef

29.40 k

31.29 fg

28.55 m

30.96 B

M

32.46 c

32.60 c

32.94 b

31.24 g

30.94 h

29.83 j

27.92 n

31.13 A

L

33.49 a

31.40 e-g

33.45 a

30.92 h

30.25 i

31.37 e-g

29.05 l

31.42 A

Main effects

32.83 A

31.98 C

32.64 B

31.22 D

30.20 F

30.83 E

28.51 G

 

G3

H

55.20 c-g

56.23 b-e

56.57 a-c

56.49 a-d

56.38 a-d

54.65 c-g

58.32 a

56.27 A

M

53.14 gh

54.44 d-g

54.18 e-g

53.52 gh

54.57 c-g

54.02 gh

53.77 gh

53.95 B

L

52 n

54.30 e-g

54.06 f-h

53.44 gh

56.44 a-d

57.63 ab

56.11 b-f

54.85 B

Main effects

53.45 C

54.99 AB

54.94 AB

54.48 BC

55.80 A

55.43 AB

56.07 A

 
  1. *Cl, control (with no biochar application); R, rice husk biochar; RA, rice husk biochar modified by HNO3; RB, rice husk biochar modified by NaOH; S, sheep manure biochar; SA, sheep manure biochar modified by HNO3; SB, sheep manure biochar modified by NaOH; H, silty clay loam; M, Loam; L, sandy loam; G1, the labile Cd or easily extractable component; G3, corresponds to the non-extractable form of Cd. Numbers followed by same letters in each column and rows,, attributed to data for each Cd fractions, are not significantly (P < 0.05) different.
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