Table 4 Mineral element constituents (mgkg⁻¹) in roots percentage absorption and immobilisation of heavy metal in M. oleifera, planted on Ca(NO₃)₂ and CaNP-amended soil

K

79.39 ± 8.41^a

82.49 ± 0.00^a

83.23 ± 3.23^a,b

86.18 ± 2.14^b,c

89.16 ± 1.14^c

87.05

88.28

90.41

87.52

92.21

Na

16.05 ± 0.59^a

15.95 ± 0.25^a,c

11.02 ± 0.42^b

13.60 ± 0.66^c

12.85 ± 0.40^b

99.09

84.08

77.86

77.42

83.85

Ca

34.11 ± 3.23^a

38.94 ± 1.99^b

40.25 ± 2.91^b

39.16 ± 2.33^b

37.03 ± 0.07^a,b

89.56

89.72

91.09

96.86

89.96

Mg

23.22 ± 3.52 ^a

22.90 ± 0.99^a

28.83 ± 7.16 ^b

24.08 ± 1.58 ^a

25.71 ± 1.61^a,b

77.77

73.87

87.68

70.38

82.41

Fe

28.40 ± 6.06^a

30.39 ± 8.17^b

34.54 ± 7.74^b

32.36 ± 2.68^a

33.87 ± 9.95^b

54.82

60.64

65.84

61.29

66.26

Mn

0.72 ± 0.01^a,b

0.91 ± 0.00 ^b

0.93 ± 0.01 ^b

0.502 ± 0.02 ^a

0.77 ± 0.01^a,b

43.09

56.02

57.06

38.96

68.01

Zn

1.19 ± 0.00 ^a

1.34 ± 0.00 ^b

1.37 ± 0.00 ^b

1.35 ± 0.00 ^b

1.12 ± 0.00 ^a

92.13

97.08

98.84

83.02

81.52

Cu

1.09 ± 0.02 ^a

0.97 ± 0.00 ^a

1.30 ± 0.01 ^b

0.94 ± 0.01 ^a

0.78 ± 0.02 ^c

88.55

66.08

90.84

49.01

51.62

Ni

0.0223 ± 0.01^a

0.0203 ± 0.01^a

0.015 ± 0.01^b

0.018 ± 0.01^a,b

0.02 ± 0.00^a

56.03

57.36

85.61

43.07

83.50

19.49

28.45

64.71

17.14

52.40

Cd

0.102 ± 0.00^a

0.018 ± 0.00 ^b

0.005 ± 0.00 ^c

0.007 ± 0.00 ^c

0.005 ± 0.00^c

20.75

16.45

4.47

6.87

4.65

28.82

84.36

84.51

84.38

85.31

Pb

0.19 ± 0.01^a

0.103 ± 0.01 ^b

0.107 ± 0.00 ^b

0.15 ± 0.00 ^a

0.16 ± 0.00 ^a

73.09

69.07

59.33

65.60

82.48

21.71

36.13

47.24

46.03

40.40

Cr

0.027 ± 0.00^a

0.027 ± 0.00^a

0.021 ± 0.00^a,b

0.022 ± 0.00^a,b

0.018 ± 0.00^b

14.85

17.47

14.64

15.61

14.02

6.87

21.57

28.83

26.03

34.07

As

nd

0.0020 ± 0.00

nd

nd

nd

0

12.66

0

0

0

100

14.13

100

100

100