LOCATION KEAWAKAPU HIEstablished Series
TAXONOMIC CLASS: Clayey over fragmental, parasesquic, isohyperthermic Aridic Haplustolls
TYPICAL PEDON: Keawakapu extremely stony silty clay loam - pasture. (Colors are for moist soil unless otherwise noted. All textures are "apparent field textures.")
A1--0 to 2 inches; dark reddish brown (5YR 3/3) extremely stony silt loam, reddish brown (5YR 4/4) dry; moderate medium and thick platy structure; soft, very friable, slightly sticky and slightly plastic; common fine roots; common fine and very fine pores; has gritty feel; few fine black concretions; 15 to 30 percent stones; delayed strong effervescence with hydrogen peroxide; neutral (pH 7.0); clear wavy boundary. (1 to 4 inches thick)
B21--2 to 9 inches; dark reddish brown (5YR 3/3) stony silty clay loam, dark reddish brown (5YR 3/4) dry; weak coarse prismatic structure; soft, friable, sticky and plastic; common fine roots; common fine pores; few hard sand-size aggregates that are resistant to crushing; few fine black concretions; 15 to 30 percent stones; strong effervescence with hydrogen peroxide; neutral (pH 7.2); gradual wavy boundary. (5 to 10 inches thick)
B22--9 to 18 inches; dark reddish brown (5YR 3/3) silty clay, dark reddish brown (5YR 3/4) dry; moderate fine and very fine subangular blocky structure; slightly hard, friable, sticky and plastic; few fine roots; many fine and medium pores; nearly continuous thin coatings on peds that look like clay films; common hard sand-size aggregates that are resistant to crushing; about 5 percent cobbles and stones; few fine black concretions; strong effervescence with hydrogen peroxide; neutral (pH 7.3); clear wavy boundary. (7 to 10 inches thick)
IIC--18 inches; fragmental Aa lava with very little soil material in voids.
TYPE LOCATION: Island of Maui, Maui County, Hawaii; Puu O Kali Quadrangle - 20 degrees 43' 12" north latitude and 156 degrees 25' 58" west longitude; 50 feet south of road and 1 mile east of Kihei Road.
RANGE IN CHARACTERISTICS: Depth of soil ranges from 12 to 30 inches to fragmental Aa lava. The mean annual soil temperature is 76 degrees F.
The A horizon has hue of 5YR or 7.5YR, values of 3 or 4 moist, and chroma of 2 or 3 moist and 3 or 4 dry.
The B horizon has value of 3 or 4 dry, and chroma of 3 or 4 moist. It is silty clay loam or silty clay. The lower part of the B horizon and the IIC horizon may effervesce with hydrochloric acid in a few places.
COMPETING SERIES: These are the Kamaole and Kekaha soils. Kamaole soils have mean annual soil temperature of 69 degrees F. Kekaha soils lack a fragmental control section and have a buried A horizon in the control section.
GEOGRAPHIC SETTING: The Keawakapu soils are on uplands. Slope is 3 to 25 percent. Outcrops of Aa lava occur near drainageways. Elevation ranges from 100 to 800 feet. The soils formed in volcanic ash over Aa lava. The mean annual temperature is about 76 degrees F.; average January temperature is 74 degrees F.; and average July temperature is 78 degrees F. Annual rainfall is 10 to 20 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Makena and Oanapuka soils and the competing Kamaole soils. Makena and Oanapuka soils have a uniform ashy control section.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: This soil is used for dryland pasture. The natural vegetation is bristly foxtail (Setaria verticillata) false mallow (Malvastrum coromandelianum), feather fingergrass (Chloris virgata), ilima (Sida fallax), kiawe (Prosopis chilensis), uhaloa (Waltheria indica), and wild zinnia (Zinnia pauciflora).
DISTRIBUTION AND EXTENT: Island of Maui, Maui County, Hawaii. This series is inextensive comprising 4,700 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Maui County, Hawaii, 1971.
OSED scanned by SSQA. Last revised by state on 5/78.