LOCATION MAMALA                  HI

Established Series
Rev. SN/MK
03/2017

MAMALA SERIES

The Mamala series consists of shallow, well drained soils that formed from alluvium deposited over coral limestone and consolidated calcareous sand. Mamala soils are on coastal plains and have slopes of 0 to 12 percent. The mean annual rainfall is 500 millimeters (20 inches) and the mean annual temperature is about 23 degrees C. (76 degrees F.)

TAXONOMIC CLASS: Clayey, parasesquic, isohyperthermic Lithic Haplocambids

TYPICAL PEDON: Mamala stony silty clay loam - irrigated sugarcane. (Colors are for moist soil unless otherwise noted. All textures are "apparent field textures.")

Ap--0 to 20 centimeters (0 to 8 inches); dark reddish brown (5YR 3/3) cobbly silty clay loam, dark reddish brown (5YR 3/4) dry; moderate fine and medium subangular blocky structure; hard, firm, sticky and plastic; compacted by recent cultivation; few fine, medium and coarse roots; few fine tubular pores; 5 percent gravel, 10 percent cobbles and 5 percent stones from coral fragments;; strong effervescence with hydrogen peroxide; neutral (pH 6.7); abrupt smooth boundary. (15 to 25 centimeters {6 to 10 inches} thick)

Bw--20 to 48 centimeters (8 to 19 inches); dark reddish brown (2.5YR 3/4) cobbly silty clay loam, dark red (2.5YR 3/6) dry; weak coarse and medium subangular blocky structure; slightly hard, friable, slightly sticky and plastic; common fine and medium roots; common very fine, fine and medium tubular pores; common 1/16 to 1/4 inch worm casts and holes coated with organic stains; 15 percent gravel, 10 percent cobbles, and 5 percent stones from coral fragments; strong effervescence with hydrogen peroxide; slightly alkaline; (pH 7.5); abrupt broken boundary. (10 to 28 centimeters {4 to 11 inches} thick)

2R--48 centimeters (19 inches); bedrock from coral limestone.

TYPE LOCATION: Honolulu County, Hawaii; Ewa Quadrangle - 21 degrees 21 minutes 14 seconds north latitude and 158 degrees 03 minutes 55 seconds west longitude (old Hawaiian datum); Ewa Sugar Plantation, field No. 43, 18 meters (60 feet) west and 18 meters (60 feet) south of the northeast corner of the field boundary.

RANGE IN CHARACTERISTICS:
Depth to coral limestone bedrock ranges from 20 to 50 centimeters (8 to 20 inches) within the limits of the pedon. Coral fragments make up 10 to 35 percent of the pedon. Mean annual soil temperature is about 23 degrees C. (74 degrees F.)

The A horizon
Hue of 5YR or 7.5YR
Value of 3 or 4 dry and 2 through 4 moist
Chroma of 3 or 4 moist and 4 through 6 dry
Sugar mill waste is on the surface and in the Ap horizon in some pedons.

The B horizon
Hue of 5YR or 2.5YR
Value of 3 or 4 dry and 2 through 4 moist
Chroma of 4 through 6 dry and 3 or 4 moist
In places, some B horizon material has been mixed in the lower part of the Ap horizon.

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: Mamala soils are on coastal plains at elevations of sea level to 30 meters (100 feet). Slope is 0 to 12 percent. The soils formed in shallow alluvium deposited over coral. The underlying coral is relatively level but has a karst surface. Outcrops of coral are common. Mean annual rainfall is 457 to 635 millimeters (18 to 25 inches). Mean annual temperature is about 23 degrees C. (74 degrees F.), average January temperature is 22 degrees C. (71degrees F.), and average July temperature is 26 degrees C. (78 degrees F.)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Ewa soils and the Honouliuli and Lualualei soils. Both of the latter soils are clay throughout, and the Honouliuli soils are more than 60 inches deep.

DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderate permeability.

USE AND VEGETATION: These soils are used for growing irrigated sugarcane, orchards, truck crops and dryland pasture. Natural vegetation is kiawe (Prosopis Pallida), koa-haole (Leucaena glauca), klu (Acacia farnesiana), bristly foxtail (Setaria verticillata), and fingergrass (Chloris spp.)

DISTRIBUTION AND EXTENT: Island of Oahu, Hawaii. This series is about 6,800 acres in extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Soil Survey, Territory of Hawaii, 1949.
OSED scanned by SSQA. Last revised by state on 5/78.

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National Cooperative Soil Survey
U.S.A.