AGYANG SERIES

Established Series PCS, JYH 20 Feb., 1979

  The Agyang series are members of the fine, mesic family of Ultic Hapludalfs [Cutanic Luvisols (Profondic Siltic Chromic) classified by WRB]. These soils have brown to dark brown silt loam Ap horizons; strong brown silty clay loam Bt horizons and yellowish brown clay loam C horizons. These soils are on mountain foot slopes derived from acidic crystalline rocks.

Typifying Pedon: Agyang silty clay loam-barley (Field description Hadong Gun profile No. 43; colors are for moist soil).

  Slope: 7-15%

  Elevation:  m above m.s.l.

  Soil moisture regime: Udic

  soil temperature regime: Mesic

  Parent material: Colluvium

  Diagnostic features: An ochric epipedon from a depth of 0 to 15 cm and an argillic horizon from a depth of 15 to 120 cm (An argic horizon from a depth of 15 to 120 cm by WRB).

Morphological properties of Agyang series.

Ap - 0 to 15 cm. Brown to dark brown (7.5YR 4/4) silt loam; moderate medium granular structure; friable, sticky and plastic; common fine pores; many fine roots; abrupt smooth boundary.

Bt1 - 15 to 36 cm. Strong brown (7.5YR 5/6) silty clay loam; moderate medium subangular blocky structure; firm, very sticky and very plastic; thin clay skins on ped faces; common fine and few coarse pores; common fine roots; clear smooth boundary.

Bt2 - 36 to 57 cm.  Strong brown (7.5YR 5/8) silty clay loam; moderate coarse subangular blocky structure; firm, very sticky and very plastic; thin clay skins on ped faces; common fine and few coarse pores; common fine roots; clear smooth boundary.

BCt - 57 to 120 cm.  Strong brown (7.5YR 5/6) silty clay loam; weak coarse subangular blocky structure; firm, very sticky and very plastic; thin clay skins on ped faces; common fine pores; few very fine roots.

Type Location: Road side of 100 m. east of Maegye Ri, Agyang Myeon, Hadong Gun, Gyeongsangnam Do.

Range in Characteristics: These soils have ochric epipedons and argillic horizons. The solum thickness ranges from 100 to 150 cm and depth to hard rock is more than 3 meters. Reaction is strongly to medium acid. Base saturation is more than 35 percent. These soils have brown to dark brown, brown or dark brown silt loam or silty clay loam Ap horizon; strong brown, or yellowish brown silty clay loam or clay loam Bt horizons and yellowish brown or strong brown clay loam or loam C horizon.

Competing Series and Their Differentiae: These are the Anryong, Gaghwa, Bangog, Galjeon and Pyeongjeon soils. The Anryong soils are fine loamy texture family with gravels. The Gaghwa soils are red colors with gravels. The Bangog soils are higher clay content and are from unconsolidated gray shale materials. The Galjeon soils have lower chroma and are formed from anorthosite geology. The Pyeongjeon soils are higher soil reaction and derived from limestone parent materials.

Setting: The Agyang soils occur on mountain foot slopes derived from acidic rocks. The slopes range from 2 to 30 percent. Dominant slopes are 7 to 15 percent.

Principal Associated Soils: These are the Anryong in similar positions, Yongji in lower positions, and Asan soils in higher mountain residual positions.

Drainage and Permeability: Well drained; very slow permeability; slow to moderate runoff.

Use and Vegetation: Upland crops.

Distribution and Extent: On mountain foot slopes of relatively high mountainous areas in Hadong Gun. These soils are inextensive.

Series Established: Hadong Gun, Gyeongsangnam Do, 1978.

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) - - - - - - - - - - -
0-15	Ap	31.0	49.9						3.8	5.1	4.1	3.7	2.4
15-36	Bt1	41.6	44.6						2.9	3.8	3.0	2.6	1.5
36-57	Bt2	40.5	49.2						1.8	3.3	2.5	2.1	0.6
57-120	B3t	41.6	41.7						3.5	4.1	4.4	3.2	1.5

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

0-15

2.01

15-36

0.65

36-57

0.61

57-120

0.47

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

0-15

42.6

32.9

22.4

15-36

40.1

30.9

18.4

36-57

39.4

30.6

16.2

57-120

-

38.0

29.2

14.8

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
0-15	4.75	1.93	0.35	0.38					12.05
15-36	3.25	2.48	0.15	0.15					10.60
36-57	3.00	2.23	0.13	0.25					9.50
57-120	2.65	2.00	0.11	0.14					9.55

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 -

0-15

61.5

4.5

5.5

15-36

56.9

4.2

5.4

36-57

59.1

4.3

5.5

57-120

51.3

4.2

6.0