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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