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Table 7 Location falling within different soil quality grades according to the utilized predictive models

From: Soil quality estimation using environmental covariates and predictive models: an example from tropical soils of Nigeria

Soil quality grade

RF

SVR

Cubist

RK

GWR

Area (ha)

%

Area (ha)

%

Area (ha)

%

Area (ha)

%

Area (ha)

%

Very high (class I)

7405

0.79

15,876

1.69

48,832

5.19

7405

0.79

70,978.05

7.54

High (class II)

477,602

50.74

749,193

79.59

525,479

55.82

477,602

50.74

469,098.09

49.83

Moderate (class III)

341,259

36.25

132,478

14.07

244,495

25.97

341,259

36.25

258,513.75

27.46

Low (class IV)

92,883

9.87

42,796

4.55

87,426

9.29

92,883

9.87

120,964.14

12.85

Very low (class V)

22,182

2.36

989

0.11

35,100

3.73

22,182

2.36

21,777.93

2.31

Total

941,332

100

941,332

100

941,332

100

941,332

100

941,332

100