The Jangcheon series are members of the mixed, mesic family of Aquic Quartzipsamments [Hydragric Anthrosols (Eutric Oxyaquic Arenic) classified by WRB]. These soils have thin olive gray fine sand Ap horizons and olive brown and grayish brown fine sand, loamy fine sand, and medium sand C horizons. They occur on continental swale river bed.

Typifying Pedon: Jangcheon fine sand-paddy rice (Field description Seonsan Gun profile No. 37; colors are for moist soils.)

  Slope: 0-2%

  Elevation:  m above m.s.l.

  Soil moisture regime: Udic (Anthraquic)

  Temperature regime: Mesic

  Parent material: Alluvium

  Diagnostic features: An ochric epipedon from a depth of 0 to 8 cm (An anthaquic horizon from a depth of 0 to 20 cm and a hydragric horizon from a depth of 20 to 120 cm by WRB).

Ap - 0 to 8 cm. Olive gray (5Y 5/2) loamy fine sand; common fine distinct yellowish brown (10YR 5/4) mottles; structureless, massive; very friable, non sticky and non plastic; many fine to medium roots; common fine micas; clear smooth boundary; pH 6.0.

C1 - 8 to 20 cm. Olive brown (2.5Y 4/3) fine sand; few fine distinct dark yellowish brown (10YR 4/4) mottles; structureless, massive; loose, non sticky and non plastic; few very fine to fine roots; micas as above; abrupt smooth boundary; pH 6.5.

C2 - 20 to 65 cm. Olive yellow to light olive brown (2.5Y 5.5/6) fine sand; few fine distinct dark yellowish brown (10YR 4/4) mottles; structureless, single grained; loose, non sticky and non plastic; common fine micas; no roots; gradual smooth boundary; pH 6.5.

C3 - 65 to 120 cm. Grayish brown (2.5Y 5/2) sand; many fine faint dark yellowish brown (10YR 4/4) mottles; structureless, single grained; loose, non sticky and non plastic; micas as above; pH 6.5.

Type Location: About 1 km. west from Dasig Village, Dasig Ri, Goa Eub, Gumi city, Gyeongsangbug Do.

Range in Characteristics: These soils have ochric epipedons. Soil depth is in excess of probably ranges from 2 to 3 meters or more over any very contrasting materials. The Jangcheon soils contain common fine mica flakes. Reaction ranges from strongly to slightly acid. Base saturation is over 60 percent except surface soils. Ap horizons are olive gray, grayish brown, or dark grayish brown fine sand, loamy fine sand, or sandy loam. C horizons are brown, yellowish brown, olive brown, olive yellow, light olive brown with gray mottles.

Competing Series and Their Differentiae: These are the Geumcheon, Nagdong, Sindab, Hwabong, Namgye, Gangseo and Opyeong series. The Geumcheon soils have coarser particle sizes and less moisture holding capacity. The Nagdong soils are similar except having better drainage. The Sindab soils are worse drainage and coarser texture. The Hwabong soils are better drainage and coarser particle sizes. The Namgye soils have skeletal throughout the profiles. The Gangseo soils are coarse loamy texture family. The Opyeong soils have coarse silty over sandy texture family.

Setting: The Jangcheon soils occur on nearly level to gently sloping undissected continental broad alluvial flood plains and on the concave side of river beds. Slopes range from 0 to 2 percent and dominant slopes are 1 to 2 percent.

Principal Associated Soils: These are the Geumcheon, Nagdong, Hwabong, Opyeong, Gangseo, and Bonryang soils. All of these soils are associated with similar physiographic positions.

Drainage and Permeability: Moderately well drained. Permeability is rapid or very rapid. Runoff is slow.

Use and Vegetation: Most areas are used for irrigated rice paddy. 

Distribution and Extent: The Jangcheon soils are of small extent and occur on the broad flood plains throughout the country.

Series Established: Seonsan Gun, Gyeongsangbug Do, 1974.

Laboratory data sheets of typifying pedon.