Established Series MINAG SERIES

horizons are black or very dark brown stony to bouldery silt loam. Bw horizons are very dark ... The Pyeongdae soils do not have stones in the profile...

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MINAG SERIES

Established Series PCS, JYH, UKT 10 Apr., 1977

The Minag series are members of the medial, ferrihydritic, thermic family of Acrudoxic Melanudands [Melanic Silandic Andosols (Acroxic Siltic) classified by WRB]. These soils have very dark brown bouldery silt loam Ap horizons, very dark brown bouldery silt loam AB horizons, dark yellowish brown bouldery silt loam Bw horizons, and dark yellowish brown bouldery silt loam BC horizons. They are developed in high elevated lava plains and are derived from pyroclastic materials. Typifying Pedon: Minag bouldery silt loam-potato (Colors are for moist soil). Slope: 2-7% Elevation: 335 m above m.s.l. Soil moisture regime: Udic Soil temperature regime: Thermic Parent material: Pyroclastic materials Diagnostic features: A melanic epipedon from a depth of 0 to 53 cm, a cambic horizon from a depth of 53 to 93 cm, and an andic soil properties from a depth of 0 to 160 cm (A melanic horizon from a depth of 0 to 53 cm, a cambic horizon from a depth of 53 to 93 cm, and an andic properties from a depth of 0 to 160 cm by WRB). Described by: Song, K. C.., S. J. Jung, and D. C. Noh,

Morphological properties of typifying pedon.

9 Sep., 2009.

Ap -

0 to 22 cm. Very dark brown (10YR 2/2) bouldery silt loam; moderate fine to medium

granular structure; friable, slightly sticky and slightly plastic; many fine to medium roots; common fine pores; clear smooth boundary. AB - 22 to 53 cm. Very dark brown (10YR 2/2) bouldery silt loam; weak fine to medium subangular blocky structure; firm, slightly sticky and slightly plastic; common fine roots; common fine to medium pores; gradual smooth boundary. Bw - 53 to 93 cm. Dark yellowish brown (10YR 4/4) bouldery silt loam; weak fine to medium subangular blocky structure; firm, sticky and plastic; few fine roots; common medium to coarse pores; clear smooth boundary. BC - 93 to 160 cm. Dark yellowish brown (10YR 4/4) bouldery silt loam; weak fine to medium subangular blocky structure; firm, sticky and plastic; few fine roots; few fine pores.

The typifying pedon contains 2.7-5.8% oxalate extractable (Al + 1/2 Fe), over 85% phosphate retention, and lower bulk density than 0.90 g/m3 from the depth of 0 to 160 cm. It has andic soil properties and keys out as Andisol. The typifying pedon has an udic soil moisture regime and can be classified as Udand. A and BA horizons (0-53 cm) have a color value, moist, and chroma of 2 or less, melanic index of 1.70 or less, and 6% or more organic carbon. That meets the requirements of melanic epipedon. That keys out as Melanudand. It has a sum of extractable bases (by NH4OAc) plus 1N KCl-extractable Al totaling less than 2.0 cmol (+)/kg in the fine-earth fraction of one or more horizons with a total thickness of 30 cm or more at a depth between 25 and 100 cm from the mineral soil surface. That can be classified as Acrudoxic Melanudand. The typifying pedon has a fine-earth fraction that has a water content at 1,500 kPa tension of 12% or more on air-dried samples and has less than 35% (by volume) rock fragments. Thus, the substitute for particle-size class is medial. It has a sum of 8 times the Si (percent by weight extracted by ammonium oxalate from the fine-earth fraction) plus 2 times the Fe (percent by weight extracted by ammonium oxalate from the fine-earth fraction) of 5 or more, and 8 times the Si is less than 2 times the Fe. It has ferrihydritic mineralogy class and thermic soil temperature class. Therefore it can be classified as medial, ferrihydritic, thermic family of Acrudoxic Melanudand.

Type Location: About 500 meters north of the Jeongseog Hanggonggwan, Gasi Ri, Pyoseon Myeon, Seogwipo city, Jeju Do (126o 21' 39.3'', 36o 30' 44.9''). Range in Characteristics: These soils have melanic epipedons, cambic horizons, and andic soil properties. The solum thickness ranges from 100 to 200 cm and depth to hard rock is more than 2 meters. Reaction is ver strongly to strongly acid. Base saturation is less than 50 percent. A horizons are black or very dark brown stony to bouldery silt loam. Bw horizons are very dark grayish brown or dark grayish brown stony to bouldery silt loam or silty clay loam. Competing Series and Their Differentiae: These are the Wimi, Pyeongdae, and Namwon soils.

The Wimi soils have gravels to cobbles throughout the profiles instead of stones to boulders. The Pyeongdae soils do not have stones in the profiles. The Namwon soils do not have stones in the profiles and have thick melanic epipedons. Setting: The Minag soils occur on gently sloping to steep lava plains and are derived from pyroclastic materials. Slope ranges from 2 to 30 percent. Principal Associated Soils: The Namwon, Topyeong, Pyeongdae, and Wimi soils are associated on similar physiographic positions. Drainage and Permeability: Well drained. Permeability is moderately rapid and runoff is medium to rapid. Use and Vegetation: Most of these soils are used for grass land. Distribution and Extent: The Minag soils are of large extent and are distributed on elevated lava plains in Jeju Do. Series Established: Seogwipo city, Jeju Do, 1975. Revised, Seogwipo city, Jeju Do, 2009. Laboratory data sheets of typifying pedon. ( --- Total ---) Clay Depth (cm)

Horizon

(-- Clay --)

Silt Sand Fine

LT

.002

.002

- .05 - 2

(-- Silt --)

(------- Sand -------)

Coarse

Fine

Coarse

VF

F

M

C

VC

LT

LT

.002

.02

.05

.10

.25

.5

1

.0002

.002

- .02

- .05

- .10

- .25

- .50

- 1

- 2

.05

- - - - - - - - - - - Pct of ˂ 2mm (3A1) - - - - - - - - - - 0-22

Ap

21.9

73.3

4.9

37.2

36.0

1.3

0.8

0.3

0.3

2.1

22-53

AB

17.3

71.4 11.3

36.3

35.0

3.8

3.0

2.0

2.1

0.5

53-93

Bw

20.4

67.3 12.3

32.6

34.7

1.6

3.4

4.5

2.4

0.5

93-160

BC

26.3

64.3

20.8

43.4

1.0

3.2

3.6

1.5

0.2

Depth (cm)

2-5

9.4

Coarse Fractions(mm)

˃2mm

Orgn

Total

Extr

Total

(-- Dith -Cit --)

Weight

Wt

C

N

P

S

Extractable

6A1c

6B3a

6S3

6R3a

Pct ˂ 2mm

g/kg

5-20

20-75

.1-75

Pct of Whole

Pct of ˂ 75mm (3B1)

Soil

0-22

14.18

22-53

13.29

53-93

2.01

93-160

1.62

Fe

Al

Mn

6C2b

6G7a

6D2a

Pct of ˂ 2mm

Ratio/Clay CEC

Atterberg

1500

Depth (cm) 8D1

( Bulk Density )

Limits

2.40

22-53

2.94

53-93 93-160

WRD

Field

33

Oven

Whole

Field

10

33

1500 Whole

LL

PI

Moist

kPa

Dry

Soil

Moist

kPa

kPa

kPa

8D1

4P1

4P

4A3a

4D1

4B4

4A1d 4A1h

- - g/cc - -

cm/cm

63.3

1.18

0.85

71.0

0.94

0.82

74.9

Ca

Mg

K

Na

Sum

5B5a

5B5a

5B5a

5B5a

Bases

6N2e

6O2d

6Q2b

6P2b

Acid-

Extr

ity

Al

6H5a

4B1c 4B1c 4B2a

-- Pct of ˂2mm --

0.62

( NH4OAc Extractable Bases ) Depth (cm)

(- Water Content -)

kPa

Pct ˂0.4mm 0-22

COLE

6G9a

Soil 4C1 cm/cm

(----- CEC -----)

Al

Sum

NH4-

Bases

Sat

Cats

OAc

+ Al

5A3a

5A8b

5A3b

- - - - - - - - - - - - meq / 100g - - - - - - - - - - - -

5G1 Pct

0-22

1.5

0.5

0.4

0.1

2.5

76.0

0.5

78.5

52.5

3.0

68.5

22-53

0.3

0.1

0.2

0.1

0.7

70.9

0.2

71.6

50.8

0.9

83.8

53-93

0.3

0.3

0.2

0

0.9

28.6

0

29.5

24.2

0.9

13.4

93-160

0.5

0.3

0.2

0

1.1

27.5

0

28.6

24.8

1.1

22.3

(Base Sat) Sum Depth (cm) 5C3

CO3 as Melanic P Ret

NH4-

CaCO3

OAc

˂2mm

5C1

6E1g

Index

(------ pH ------) NaF

Acid Oxalate Extraction

KCl CaCl2 H2O

Opt

.01M

Den

8C1d

8C1f 8C1f

---- Pct ----

Pct

1: 1

1: 2

1: 1

8J

Al

Fe

6G12 6C9a

Si 6V2

- Pct of ˂2mm -

0-22

3.2

4.7

97.4

4.3

4.6

4.9

2.38

2.67

0.27

22-53

0.9

1.3

99.2

4.5

4.7

4.9

3.88

3.78

0.65

53-93

3.1

3.7

97.2

5.0

5.2

5.4

2.23

2.35

0.83

93-160

3.8

64.4

98.5

4.8

5.1

5.3

1.66

2.05

0.57