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Table 6 pH(NaF) and acid oxalate-extractable Al, Fe and Si of the soils sampled from Eniwa and Narita farms

From: Characterisation of soils under long-term crop cultivation without fertilisers: a case study in Japan

Horizon

pH

Acid-oxalate (g kg−1)

Alo + 1/2Feo (%)

NaF

Alo

Feo

Sio

E-UF

 Ap

11.96

12.11

6.10

2.72

1.52

 A1

11.98

10.50

5.32

2.31

1.32

 A2

11.98

12.44

5.79

2.76

1.53

 2A3

10.27

58.22

16.47

15.96

6.65

 3AB

11.28

70.53

17.92

27.33

7.95

 4Bw

11.72

56.86

9.78

27.41

6.18

E-CF

 Ap1

12.01

10.87

5.74

2.41

1.37

 Ap2

11.97

11.91

6.15

2.74

1.50

 Ap3

11.98

13.02

6.12

2.99

1.61

 2A

10.57

57.42

17.38

15.55

6.61

 3AB

11.55

71.11

15.82

29.90

7.90

 4Bw

11.92

46.40

6.35

22.04

4.96

N-UF

 Ap

9.85

13.74

18.16

4.42

2.28

 A1

9.94

13.41

17.73

4.60

2.23

 A2

10.35

15.83

23.42

6.62

2.75

 AB

10.96

31.67

29.65

14.63

4.65

 Bw1

11.21

54.36

34.18

30.06

7.14

 Bw2

11.23

98.90

37.09

59.73

11.74

N-CF

 Ap

10.31

18.10

19.18

7.11

2.77

 A1

10.36

18.30

19.70

7.49

2.81

 A2

10.72

25.79

28.30

11.44

3.99

 AB

11.13

49.38

34.99

25.54

6.69

 Bw

11.23

63.34

39.26

35.85

8.30

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