Sample

Total Cu (mg/kg)

Extraction of Cu by 1M NH₄Cl (mg/kg)

Extraction of Cu by 0.005M DTPA (mg/kg)

Extraction of Cu by 1M HCl (mg/kg)

Single

Sequential

Single

Sequential

Single

Sequential

S(G1)

50.1

0.391

2.879

2.852

0.001

17.931

21.3

S(G2)

54.3

0.712

0.09

4.404

0.003

20.564

36.06

S(G3)

47

1.435

0.061

4.782

0.002

18.431

49.46

S(G4)

64.6

4.039

0.634

4.926

0.004

29.93

50.56

S(G5)

59.2

1.069

0.325

4.136

0.001

20.231

32.73

Average

55.04

1.529

0.798

4.220

0.002

21.417

38.022

S(B6)

67.4

1.081

0.518

4.644

0.009

24.397

61.43

S(B7)

64.7

0.577

0.22

4.368

0.004

22.764

65.36

S(B8)

56.4

0.265

0.69

2.498

0.002

23.93

67.69

S(B9)

89.9

0.709

0.167

3.018

0.008

27.863

32.2

S(B10)

81.8

0.865

0.445

4.476

0.009

19.264

49.13

Average

72.04

0.699

0.408

3.801

0.006

23.644

55.162