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APPENDIX 3 - Physico-chemical Characterization of Soils in Iraq (after Barzanji 1973)

Profile 1

Typic Gypsiorthid


Horizon

 

Depth

Particle size

Texture class

pH

(cm)

 

Clay

Silt

Sand

(USDA)

 

KCl

 

H2O

 

(%)

(%)

(%)

A1

0-20

15.90

52.35

31.75

Silt loam

7.6

8.0

C1cs

20-45

15.25

40.20

44.55

Loam

7.5

7.9

C2cs

45-65

13.55

54.70

31.75

Silt loam

7.5

8.1

C3cs

65-100

17.25

47.90

34.85

Loam

7.3

7.8

C4cs

100-145

16.25

47.50

36.25

Loam

7.4

8.0

C5cs

145-200

17.15

46.65

36.20

Loam

7.3

7.8


Horizon

 

Depth

EC 103

OC

Exch Na

CaCO3

CaSO4. 2H2O

CEC

(cm)

(dS m-1)

(%)

(%)

(%)

(%)

mEq/100 g

A1

0-20

2.60

0.24

3.3

29.0

1.84

14.2

C1cs

20-45

2.40

0.12

3.2

5.9

68.30

7.4

C2cs

45-65

2.60

0.08

3.0

3.4

74.82

8.8

C3cs

65-100

2.60

-

3.2

3.6

61.92

11.0

C4cs

100-145

2.60

-

3.0

4.0

66.22

10.6

C5cs

145-200

2.60

-

3.0

3.2

63.64

9.8


Profile 2 Typic Torriorthent on Upper Tigris Terrace

Horizon

 

Depth

Particle size

Texture class

pH

(cm)

Clay

Silt

Sand

(USDA)

 

KCl

H2O


(%)

(%)

(%)



A1

0-20

21.65

39.25

39.10

Loam

7.8

8.2

C1

20-50

34.95

40.45

24.60

Clay loam

7.8

8.2

C2

50-110

40.40

42.80

16.80

Silty clay

7.8

8.2

C3

110-147

37.60

49.55

12.85

Silty clay

7.6

8.1

C4cs

147-200

8.90

76.70

14.40

Silt loam

7.6

8.1


Horizon

 

Depth

EC 103

OC

Exch Na

CaCO3

CaSO4. 2H2O

CEC

(cm)

(dS m-1)

(%)

(%)

(%)

(%)

mEq/100 g

A1

0-20

0.9

0.38

1.4

17

0.03

13.4

C1

20-50

3.9

0.20

3.5

21

0.09

15.2

C2

50-110

5.6

0.08

5.8

21

0.04

16.8

C3

110-147

5.0

-

4.5

24

0.54

17.2

C4cs

147-200

5.0


4.0

21

6.88

15.6


Profile 3 Calcic Gypsiorthid

Horizon

 

Depth

Particle size

Texture class

pH

(cm)

 

Clay

Silt

Sand

(USDA)

 

KCl

 

H2O

 

(%)

(%)

(%)

A1

0-15

20.45

56.60

22.95

Silt loam

7.5

8.1

C1ca

15-60

26.70

49.20

24.10

Loam

7.6

8.1

C2cs

60-95

32.45

38.60

28.95

Clay loam

7.3

7.6

C3cs

95-115

26.20

40.20

33.60

Loam

7.3

8.0

C4cs

115-200

23.20

41.50

35.30

Loam

7.4

7.9


Horizon

 

Depth

EC 103

OC

Exch Na

CaCO3

CaSO4. 2H2O

CEC

(cm)

(dS m-1)

(%)

(%)

(%)

(%)

mEq/100 g

A1

0-15

2.2

0.44 6.8

1.2

18.0

0.11

14.6

C1ca

15-60

2.3

0.16

1.6

23.5

0.44

14.6

C2cs

60-95

3.2


1.3

17.5

9.46

15.4

C3cs

95-115

2.9


1.2

9.1

44.72

15.0

C4cs

115-200

2.7


1.2

8.1

44.72

14.6


Profile 4 Cambic Gypsiorthid

Horizon

 

Depth

Particle size

Texture class

pH

(cm)

 

Clay

Silt

Sand

(USDA)

 

KCl

 

H2O

 

(%)

(%)

(%)

A1

0-22

22.85

34.55

42.60

Loam

7.9

8.2

C1

22-54

21.55

28.15

50.30

Loam

8.0

8.4

C2

54-70

13.70

15.20

71.10

Sandy loam

8.1

8.4

C3cs

70-140

16.0

32.60

51.40

Sandy loam

7.7

8.2

C4cs

140-178

9.20

13.70

77.10

Loamy sand

7.6

8.3

C5

178-200




Sand

7.7

8.0


Horizon

 

Depth

EC 103

OC

Exch Na

CaCO3

CaSO4. 2H2O

CEC

(cm)

(dS m-1)

(%)

(%)

(%)

(%)

mEq/100g

A1

0-22

2.2

0.36

1.6

20.0

0.04

13.8

C1

22-54

1.8

0.12

1.8

21.0

0.05

12.0

C2

54-70

2.2


1.2

20.0

0.09

10.0

C3cs

70-140

2.9


1.1

10.5

19.78

21.6

C4cs

140-178

3.0


1.2

12.5

8.77

20.8

C5

178-200

4.5


1.5


1.11



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