Table 1 Physicochemical properties and heavy metal concentration of soil and chemical amendments used in the experiment

Soil texture

 Sand (%)

67.7

 Silt (%)

15.5

 Clay (%)

16.8

Sandy loam

 pH (1:5)

5.54 ± 0.05

7.85 ± 0.03

10.35 ± 0.02

12.43 ± 0.01

 EC (dS m⁻¹)

0.10 ± 0.01

0.59 ± 0.01

0.35 ± 0.02

0.76 ± 0.04

 OM (%)

1.50 ± 0.08

 Av. P₂O₅^a (mg kg⁻¹)

42.4 ± 6.80

 Total-Cd (mg kg⁻¹)

2.60 ± 0.02

2.20 ± 0.32

0.20 ± 0.01

2.18 ± 0.03

 Total-Pb (mg kg⁻¹)

1,289 ± 27.7

15.9 ± 3.50

8.30 ± 1.32

9.0 ± 5.2

 CaO^b (%)

4.03

97.8

29.3

 SiO₂ (%)

6.93

0.76

12.2

 Al₂O₃ (%)

5.91

0.40

6.00

 Fe₂O₃ (%)

80.3

0.33

41.6