The Gocheon series are members of the coarse loamy over sandy skeletal, mixed, mesic family of Anthraquic Eutrudepts [Hydragric Anthrosols (Eutric Oxyaquic) classified by WRB]. These soils have dark gray sandy loam Ap horizons with dark brown mottles, very dark grayish brown sandy loam BAg horizons with dark yellowish brown and reddish brown mottles, brown sandy loam Bw horizons with brown mottles, and brown very gravelly loamy coarse sand C horizons. These soils are on alluvial plains.

Typifying Pedon: Gocheon sandy loam-paddy rice. (Colors are for moist soil).

  Slope: 0-2%

  Elevation: 278 m above m.s.l.

  Soil moisture regime: Udic (Anthraquic)

  Soil temperature regime: Mesic

  Parent material: Alluvium

  Diagnostic features: An ochric epipedon from a depth of 0 to 18 cm and a cambic horizon from a depth of 38 to 61 cm (An anthraquic horizon from a depth of 0 to 38 cm and a hydragric horizon from a depth of 38 to 61 cm by WRB).

  Described by: Song, K. C., D. C. Noh, and B. K. Hyun,  12 March, 2013.

Ap - 0 to 18 cm. Dark gray (10YR 4/1) sandy loam; few fine to medium distinct dark brown (7.5YR 3/4) mottles; structureless, puddled; slightly sticky and slightly plastic; common fine to medium roots; common fine to medium pores; 5% fine gravels; clear smooth boundary.

BAg - 18 to 38 cm. Very dark grayish brown (10YR 3/2) gravelly sandy loam; many medium to coarse faint dark yellowish brown (10YR 3/4) mottles and common prominent reddish brown (2.5YR 4/4) mottles; weak medium to coarse platy structure; very firm, slightly sticky and slightly plastic; few fine roots; few fine pores; 10% gravels; gradual smooth boundary.

Bw - 38 to 61 cm. Brown (7.5YR 4/3) gravelly sandy loam; common medium to coarse faint brown (7.5YR 4/4) mottles; weak coarse platy structure; slightly firm, sticky and plastic; few fine roots; few medium to coarse pores; 15% gravels; clear wavy boundary.

C   - 61 to 150 cm. Brown (10YR 4/3) very gravelly loamy coarse sand; structureless, massive; slightly sticky and slightly plastic; no roots; no pores; 40% gravels and cobbles.

  The typifying pedon has an ochric epipedon from a depth of 0 to 18 cm and a cambic horizon from a depth of 38 to 61 cm. That can be classified as Inceptisol. It is used for paddy field, but does not have aquic conditions for some time in normal years in a layer at a depth between 40 and 50 cm from the mineral soil surface. Therefore it can be classified as Udept. It has a base saturation (by NH4OAc) of 60% or more in one or more horizons at a depth between 25 and 75 cm from the mineral soil surface. That keys out as Eutrudept. It has anthraquic conditions and can be classified as Anthraquic Eutrudept.

  The typifying pedon has coarse loamy over sandy skeletal particle-size class and has mesic soil temperature class. Therefore it can be classified as coarse loamy over sandy skeletal, mixed, mesic family of Anthraquic Eutrudept.

Type Location: About 400 meters south-west of Pyeongji Church, Pyeongji Ri, Maryeong Myeon, Jinan Gun, Jeollabug Do (127° 22' 38.6'', 35° 43' 29.2'').

Range in Characteristics: These soils have ochric epipedons and cambic horizons. The solum thickness ranges from 50 to 100 cm. Reaction is strongly to slightly acid and base saturation is more than 50 percent. Ap horizons are dark grayish brown, grayish brown, very dark gray, or gray sandy loam or loam with few gravels. Bw horizons are dark yellowish brown, yellowish brown gravelly sandy loam or loam with yellowish brown mottles. C horizons are dark yellowish brown, yellowish brown, or brownish yellow very gravelly to very cobbly loamy sand.

Competing Series and Their Differentiae: These are Deogcheon, Seoggye, Gacheon, and Manseong soils. The Deogcheon soils are better drained and used for cultivated upland. The Seoggye soils are coarse loamy over sandy texture family and are worse drained. The Gacheon soils are worse drained. The Manseong soils are fine loamy over sandy skeletal and have imperfectly drainage.

Setting: The Gocheon soils occur on continental flood plains along the main rivers and are derived from mixed recent alluvial materials. Dominant slopes are about 1 percent and range from 0 to 2 percent.

Principal Associated Soils: These are associated with the Hwangryong, Namgye, Hagsan, Tongcheon, and Gacheon soils. The Hwangryong soils are sandy skeletal texture family and somewhat excessively drainage occured in river sides. The Namgye soils are sandy skeletal and moderately well drained soils and also occur in river sides. The Hagsan soils have fine loamy over sandy texture family, and occur on similar physiographic positions.

Drainage and Permeability: The Gocheon soils are moderately well drained and permeability is moderately rapid. Runoff is slow.

Use and Vegetation: Most of these soils are used for paddy rice and barley.

Distribution and Extent: The Gocheon soils are of small extent and occur on alluvial plains along the streams throughout the country.

Series Established: Wanju Gun, Jeollabug Do, 1973. Revised, Jinan Gun, Jeollabug Do, 2013.

Laboratory data sheets of typifying pedon.