The Gagog series are members of the fine silty, mixed, mesic family of Typic Endoaquepts [Gleyic Hydragric Anthrosols (Eutric Siltic) classifed by WRB]. These soils have grayish brown silt loam Ap horizons with yellowish red mottles, dark grayish brown silty clay loam BAg horizons with strong brown mottles, grayish brown silty clay loam Bg1 horizons with strong brown mottles, dark grayish brown silty clay loam Bg2 horizons with strong brown mottles, and dark gray silty clay loam BCg horizons with dark yellowish brown mottles. They are developed on gently sloping valleys derived from porphyry rocks and similar materials.

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

  Slope: 2-7%

  Elevation: 8 m above m.s.l.

  Soil moisture regime: Aquic

  Soil temperature regime: Mesic

  Parent material: Alluvium-colluvium from porphyry rocks

  Diagnostic features: An ochric epipedon from a depth of 0 to 18 cm and a cambic horizon from a depth of 34 to 72 cm (An anthraquic horizon from a depth of 0 to 34 cm and a hydragric horizon from a depth of 34 to 72 cm by WRB).

  Described by: Song, K. C., S. J. Jung, and D. C. Noh,  15 March, 2011.

Ap  - 0 to 18 cm. Grayish brown (2.5Y 5/2) silt loam; common fine to medium prominent yellowish red (5YR 4/6) mottles; structureless, puddled; sticky and plastic; many fine to medium roots; common fine to medium pores; few fine micas; abrupt smooth boundary.

BAg - 18 to 34 cm. Dark grayish brown (2.5Y 4/2) silty clay loam; common fine to medium prominent strong brown (7.5YR 5/6) mottles; weak medium to coarse prismatic structure; firm, sticky and plastic; thin patch clay cutans; common fine roots; common fine to medium pores; few fine micas; clear smooth boundary.

Bg1 - 34 to 50 cm. Grayish brown (2.5Y 5/2) silty clay loam; common fine to medium prominent strong brown (7.5YR 4/6) mottles; moderate fine to medium prismatic structure; firm, sticky and plastic; thin continuous clay cutans; few fine roots; common fine pores; few fine micas; common iron coatings; clear smooth boundary.

Bg2 - 50 to 72 cm. Dark grayish brown (2.5Y 4/2) silty clay loam; common fine to medium prominent strong brown (7.5YR 5/6) mottles; moderate medium to coarse prismatic structure; firm, sticky and plastic; thick continuous clay cutans; few fine roots; few fine pores; few fine micas; clear smooth boundary.

BCg - 72 to 160 cm. Dark gray (2.5Y 4/1) silty clay loam; common fine to medium prominent dark yellowish brown (10YR 4/4) mottles; weak medium to coarse prismatic structure; firm, sticky and plastic; thick continuous clay cutans; no roots; few fine pores; few fine micas.

  The typifying pedon has an ochric epipedon from a depth of 0 to 18 and a cambic horizon from a depth of 34 to 72 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 meets the requirements of Typic Endoaquept.

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

Type Location: About 500 meters north-east of the Daemyeong Reservoir, Geumsong Ri, Sani Myeon, Haenam Gun, Jeollanam Do (126° 29' 10.9'', 34° 37' 32.3'').

Range in Characteristics: These soils have ochric epipedons and cambic horizons. Solum thickness from 100 to 200 cm. Base saturation varies but generally more than 50 percent. Reaction is strongly to medium acid. Ap horizons are grayish brown, dark grayish brown, or gray silt loam, loam, or silty clay loam with very dark gray or strong brown mottles. The Bg horizons are dark gray, grayish brown, gray, or dark grayish brown silt loam, loam or silty clay loam with prominent strong brown or yellowish brown mottles.

Competing Series and Their Differentiae: These are the Bonggog, Jonggog, and Bogcheon soils.  The Bonggog soils are formed in reddish brown shale areas. The Jonggog soils are derived from  phyllite and schist of Ogcheon system. The Bogcheon soils occur on fluvio-marine plains.

Setting: The Gagog soils occur on gently slopping to slopping narrow local valleys and on fans derived from porphyry rocks. Dominant slopes are 2 to 7 percent and slopes range from 2 to 15 percent.

Principal Associated Soils: The Gagog soils are associated with the Mudeung, Taehwa, Bongsan, Nasan and Bonggye soils in the higher residual positions, and Gangjin in the similar positions.

Drainage and Permeability: Imperfectly drained. Permeability is probably moderate or moderately slow. Runoff is controlled by artificially for paddy rice cultivation.

Use and Vegetation: All areas are used for paddy rice during wet summer season, for barley or wheat during dry winter season.

Distribution and Extent: The Gagog soils are of small extent and are distributed in local valleys derived from porphyry throughout the country.

Series Established: Milyang Gun, Gyeongsangnam Do, 1975. Revised, Haenam Gun, Jeollanam Do, 2011.

Laboratory data sheets of Gagog series.