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Table 2 Percent of ash, C, N, and C/N ratio, of humic extracts and soil residues

From: Infrared spectra of soil organic matter under a primary vegetation sequence

Profile

Horizon

Sample

Ash

C

N

C/N

I

H

Total soila

37.9

35.3

1.12

31.5

H

Water-extractb

7.4

45.3

1.92

23.6

H

Alkali-extractc

4.9

50.4

1.55

32.5

H

Humind

11.7

49.0

1.00

49.0

B

Total soil

99.2

0.2

0.02

10.0

B

Alkali-extract

11.5

41.5

1.63

25.5

B

Humin

70.2

11.1

0.32

34.7

II

H

Total soil

22.3

41.0

1.42

28.9

H

Water-extract

7.0

44.6

2.15

20.7

H

Alkali-extract

5.4

51.7

1.95

26.5

H

Humin

12.9

49.0

1.32

37.1

B

Total-soil

99.0

0.5

0.02

25.0

B

Alkali-extract

12.5

41.4

1.67

24.8

B

Humin

67.9

16.4

0.52

31.5

III

H

Total-soil

58.5

22.1

0.93

23.8

H

Water-extract

9.3

44.3

2.45

18.4

H

Alkali-extract

4.7

51.6

2.38

21.7

H

Humin

16.0

49.5

1.60

30.9

B

Total soil

98.4

0.8

0.04

20.0

B

Alkali-extract

10.2

43.9

2.18

20.1

B

Humin

71.4

19.7

0.56

35.2

  1. aWhole soil sample
  2. bWater-extract from the soil sample
  3. cAlkali-extract from the soil sample
  4. dSoil residue (Humin) after alkali extraction