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Table 1 Physicochemical properties of farmland

From: Bioaccumulation of heavy metals in soil and selected food crops cultivated in Kogi State, north central Nigeria

Properties

Depth (cm)

Farmland soils (n = 300)

Control soils (n = 32)

Range

Mean

SD

Median

Range

Mean

SD

pH

0–15

5.59–6.90

6.29

0.27

6.73

5.08–7.20

6.87

0.76

15–30

5.20–6.49

5.88

0.37

633

5.70–7.24

6.18

0.66

OC (%)

0–15

3.82–10.1

4.87

0.18

4.55

4.32–11.3

5.6

2.3

15–30

3.39–6.74

4.55

0.12

4.34

3.73–6.01

4.44

0.08

OM (%)

0–15

6.60–17.5

8.45

0.47

7.85

7.46–20.1

9.3

4.6

15–30

5.58–11.7

7.87

0.24

7.50

6.50–10.4

7.33

0.33

Sand (%)

0–15

47.0–84.4

72

15

78.3

75.5–84.4

76.7

4.6

15–30

44.5–82.4

71

13

75.5

66.7–79.6

75.0

5.9

Silt (%)

0–15

4.60–36

12.4

8.5

9.3

4.20–6.80

7.0

1.9

15–30

4.60–34.1

12.2

9.6

9.50

4.20–8.60

8.5

4.8

Clay (%)

0–15

10.8–21.5

15.6

6.9

15.8

10.6–17.9

14.3

3.9

15–30

10.6–22.0

16.6

6.3

17.3

16.2–24.7

17.5

6.1