The Yegog series are members of the fine loamy, mixed, mesic family of Fluvaquentic Endoaquepts [Fluvic Gleyic Hydragric Anthrosols (Eutric) classified by WRB]. These soils have dark gray silt loam Ap horizons with brown mottles, black gravelly silt loam BAg horizons with brown mottles, black gravelly silt loam Bg horizons with dark yellowish brown mottles, and black gravelly silt loam BCg horizons with dark yellowish brown mottles. These soils are on local valleys from limestone schist of the Ogcheon system.

Typifying Pedon: Yegog silt loam-paddy rice (Colors are for moist soil).

  Slope: 2-7%

  Elevation: 132 m above m.s.l.

  Soil moisture regime: Aquic

  Soil temperature regime: Mesic

  Parent material: Local alluvium from limestone schist

  Diagnostic features: An ochric epipedon from a depth of 0 to 19 cm and a cambic horizon from a depth of 38 to 67 cm (An anthraquic horizon from a depth of 0 to 38 cm and a hydragric horizon from a depth of 38 to 67 cm by WRB).

  Described by: Song, K. C., D. C. Noh, and B. K. Hyun,  26 March, 2013.

Morphological properties of typifying pedon.

Ap  - 0 to 19 cm. Dark gray (2.5Y 4/1) silt loam; common fine to medium prominent brown (7.5YR 4/4) mottles; structureless, puddled; sticky and plastic; common fine to medium roots; common fine to medium pores; common fine micas; 5% fine gravels; clear wavy boundary.

BAg - 19 to 38 cm. Black (5Y 2.5/1) gravelly silt loam; few fine prominent brown (10YR 4/3) mottles; weak coarse prismatic structure; firm, slightly sticky and plastic; thin patch clay cutans; few fine roots; few fine pores; few very fine micas; 15% gravels; gradual smooth boundary.

Bg - 38 to 67 cm. Black (2.5Y 2.5/1) gravelly silt loam; few fine distinct dark yellowish brown (10YR 3/4) mottles; weak coarse prismatic structure; slightly firm, sticky and plastic; thin patch clay cutans; few fine roots; common fine to medium pores; few very fine micas; 15% fine gravels; gradual smooth boundary.

BCg - 67 to 150 cm. Black (5Y 2.5/1) gravelly silt loam; few fine to medium distinct dark yellowish brown (10YR 4/4) mottles; weak coarse prismatic structure; slightly firm, sticky and plastic; thin continuous clay cutans; no roots; common fine to medium pores; few very fine micas; 20% gravels.

  The typifying pedon has an ochric epipedon from a depth of 0 to 19 cm and a cambic horizon from a depth of 38 to 67 cm. It can be classified as Inceptisol. It has aquic conditions for some time in normal years in a layer at a depth between 40 and 50 cm from the mineral soil surface, and has a layer within 50 cm of the mineral soil surface, that has, on the faces of peds, 50% or more chroma of 2 or less, and has redox concentrations. Therefore it can be classified Aquept. It has endosaturation and keys out as Endoaquept. It has a slope of less than 25% and at a depth of 125 cm below the mineral soil surface, an organic-carbon content (Holocene age) of 0.2% or more and no densic, lithic, or paralithic contact within that depth. That can be classified as Fluvaquentic Endoaquept.

  The typifying pedon has fine loamy particle-size class and mesic soil temperature class. Therefore it can be classified as fine loamy, mixed, mesic family of Fluvaquentic Endoaquept.

Type Location: About 100 meters south-west of Neulchi Reservoir, Gugwon Ri, Gunbug Myeon, Ogcheon Gun, Chungcheongbug Do (127^o 36' 13.5'', 36^o 20' 20.1'').

Range in Characteristics: These soils have ochric epipedons and cambic horizons. The solum thickness ranges from 100 to 150 cm and depth to hard rock is more than 3 meters. Reaction is slightly to medium acid. Base saturation is more than 60 percent. The gravel content ranges from 10 to 35 percent. These soils have very dark gray or dark gray silt loam Ap horizons with yellowish brown or strong brown mottles and dark gray or very dark gray gravelly silt loam or loam Bg horizons with strongbrown mottles.

Competing Series and Their Differentiae: These are the Imgog, Yugog, and Gangdong soils. The Imgog soils are derived acid crystalline materials. The Yugog soils are formed from gray shale geology. The Gangdong soils occur on alluvial plains and poorly drained.

Setting: The Yegog soils are on local valleys from limestone schist or phyllite of the Ogcheon system. The slopes range from 2 to 15 percent and dominant slopes are 2 to 7 percent.

Principal Associated Soils: These are the Jonggog soils in similar positions, the Namgog soils in higher upland positions, and the Banggog soils in higher colluvial positions.

Drainage and Permeability: Imperfectly drained; slow permeability; slow runoff.

Use and Vegetation: Used for rice paddy.

Distribution and Extent: On the Ogcheon system in Ogcheon, Boeun and Danyang Gun.

Series Established: Ogcheon Gun, Chungcheongbug Do, 1978. Revised, Ogcheon Gun, Chungcheongbug Do, 2013.

Laboratory data sheets of typifying pedon.

Depth (cm)	Horizon	( --- Total ---)			(-- Clay --)		(-- Silt --)		(------- Sand -------)
		Clay	Silt	Sand	Fine	Coarse	Fine	Coarse	VF	F	M	C	VC
		LT	.002	.05	LT	LT	.002	.02	.05	.10	.25	.5	1
		.002	- .05	- 2	.0002	.002	- .02	- .05	- .10	- .25	- .50	- 1	- 2
		- - - - - - - - - - - Pct of ˂ 2mm (3A1) - - - - - - - - - - -
0-19	Ap	18.2	42.6	39.2			18.0	24.6	15.1	14.5	4.0	3.4	1.3
19-38	BAg	18.9	41.9	39.2			16.5	25.4	15.6	15.5	4.2	2.4	1.5
38-67	Bg	18.7	45.9	35.4			12.9	33.0	17.6	13.1	2.5	1.5	0.7
67-150	BCg	18.7	42.2	39.1			10.9	31.3	18.7	14.2	3.0	2.0	1.2

Depth (cm)

Coarse Fractions(mm)

˃2mm

Orgn

Total

Extr

Total

(-- Dith -Cit --)

Weight

Wt

C

N

P

S

Extractable

2-5

5-20

20-75

.1-75

Pct of

Fe

Al

Mn

Whole

6A1c

6B3a

6S3

6R3a

6C2b

6G7a

6D2a

Pct of ˂ 75mm (3B1)

Soil

Pct ˂ 2mm

g/kg

Pct of ˂ 2mm

0-19

0.97

19-38

0.92

38-67

0.86

67-150

0.73

Depth (cm)

Ratio/Clay

Atterberg

( Bulk Density )

COLE

(- Water Content -)

WRD

CEC

1500

Limits

Field

33

Oven

Whole

Field

10

33

1500

Whole

kPa

LL

PI

Moist

kPa

Dry

Soil

Moist

kPa

kPa

kPa

Soil

8D1

8D1

4P1

4P

4A3a

4A1d

4A1h

4D1

4B4

4B1c

4B1c

4B2a

4C1

Pct ˂0.4mm

- - g/cc - -

cm/cm

-- Pct of ˂2mm --

cm/cm

0-19

0.60

1.13

45.8

19-38

0.49

1.22

37.6

38-67

0.45

67-150

0.42

Depth (cm)	( NH4OAc Extractable Bases )					Acid-	Extr	(----- CEC -----)			Al
	Ca	Mg	K	Na	Sum	ity	Al	Sum	NH4-	Bases	Sat
	5B5a	5B5a	5B5a	5B5a	Bases			Cats	OAc	+ Al
	6N2e	6O2d	6Q2b	6P2b		6H5a	6G9a	5A3a	5A8b	5A3b	5G1
	- - - - - - - - - - - - meq / 100g - - - - - - - - - - - -										Pct
0-19	8.6	2.1	0.5	0.1	11.3	5.4	0	16.7	10.9	11.3	0
19-38	6.4	1.7	0.4	0.1	8.7	3.7	0	12.4	9.3	8.7	0
38-67	5.1	1.2	0.7	0.2	7.2	6.8	0	14.0	8.5	7.2	0
67-150	4.7	1.1	0.4	0.1	6.3	6.5	0	12.8	7.8	6.3	0

Depth (cm)

(Base Sat)

CO3 as

Res

Cond

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

Acid Oxalate Extraction

Sum

NH4-

CaCO3

NaF

KCl

CaCl2

H2O

Opt

Al

Fe

Si

OAc

˂2mm

.01M

Den

5C3

5C1

6E1g

8E1

8I

8C1d

8C1f

8C1f

8J

6G12

6C9a

6V2

---- Pct ----

ohms/cm

dS/m

1: 1

1: 2

1: 1

- Pct of ˂2mm -

0-19

67.7

100

5.1

6.0

6.3

19-38

70.1

93.4

5.1

5.8

6.3

38-67

51.4

84.6

4.7

5.4

5.9

67-150

49.3

81.1

4.6

5.2

5.9