LOCATION HANA HIEstablished Series
TAXONOMIC CLASS: Hydrous, amorphic, isohyperthermic Typic Hydrudands
TYPICAL PEDON: Hana very stony silty clay loam - pasture. (Colors are for moist soil unless otherwise noted. All textures are "apparent field textures".)
Ap--0 to 7 inches; very dark brown (10YR 2/2) very stony silty clay loam; strong very fine and fine subangular blocky structure; very hard, friable, slightly sticky, slightly plastic and moderately smeary; many very fine and fine roots; many fine pores; common worm casts; 1 to 3 percent stones on surface; strongly acid (pH 5.1); gradual smooth boundary. (6 to 8 inches thick)
A--7 to 12 inches thick; very dark grayish brown (10YR 3/2) silty clay loam; strong very fine and fine subangular blocky structure; very hard, friable, slightly sticky, slightly plastic and moderately smeary; many very fine and fine roots; many fine pores; few worm casts; common moderately weathered fine cinders; moderately acid (pH 5.8); clear wavy boundary. (4 to 6 inches thick)
Bw1--12 to 20 inches; dark brown (7.5YR 3/2) silty clay loam; moderate medium and fine subangular blocky structure; very hard; friable, sticky, plastic and moderately smeary; many very fine and fine roots; many fine pores; common fine red weathered cinders; slightly acid (pH 6.1); gradual wavy boundary. (7 to 9 inches thick)
Bw2--20 to 34 inches; dark brown (7.5YR 3/2) silty clay loam; moderate fine and medium subangular blocky structure; hard, very friable, slightly sticky, slightly plastic and moderately smeary; many very fine and fine roots; many fine and medium pores; 5 percent hard rock fragments; slightly acid (pH 6.1); abrupt wavy boundary. (10 to 17 inches thick)
2C--34 to 60 inches; red and grayish brown moderately weathered gravel-size cinders over `a`a lava.
TYPE LOCATION: Island of Maui, Maui County, Hawaii; 50 feet south of State Highway 36 and about 1.4 miles southwest of Hana Airport; Hana Quadrangle; lat. 20 degrees 47 minutes 14 seconds N. and long. 156 degrees 02 minutes 04 seconds W. (Old Hawaiian Datum).
RANGE IN CHARACTERISTICS: Depth of soil ranges from 27 to 40 inches over cinders or `a`a lava. Surface stoniness ranges from very stony to extremely stony.
The A horizon has hue of 7.5YR or 10YR, value of 2 or 3, and chroma of 2 or 3.
The B horizon has hue of 5YR through 10YR, value of 2 through 4 and chroma of 2 through 4.
COMPETING SERIES: (This needs updating.) These are the Hilo and Olaa soils. Hilo soils are more than 60 inches deep, have volcanic ash bands and prismatic structure in the B horizon. Olaa soils have a fragmental control section.
GEOGRAPHIC SETTING: Hana soils are on uplands. Slope is 3 to 25 percent. Outcrops of basalt are common. Elevation ranges from sea level to 1,200 feet. The soils formed in volcanic ash over cinders and `a`a lava. Annual rainfall is 80 to 150 inches. Mean annual temperature is about 73 degrees F.; average January temperature is 70 degrees F.; average July temperature is 76 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Honomanu and Malama soils. Honomanu soils have an O horizon and B horizons that are strongly smeary. Malama soils are very thin organic soils over fragmental `a`a lava.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are used for pasture. The natural vegetation is bracken fern (Pteridium aquilium), californiagrass (Panicum purpurascens), eucalyptus (Eucalyptus sp.), guava (Psidium guajava), kaimi clover (Desmodium canum), koa (Acacia koa) and sedge (Carex sandwicensis).
DISTRIBUTION AND EXTENT: Island of Maui, Maui County, Hawaii. This series is intensive, with a total of approximately 8,000 acres.
MLRA OFFICE RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Maui County, Hawaii, 1971.
REMARKS:
FCC Classification: C'''hkx.
Edit Log: 12/03 SN. Horizon designation updated; FCC added.
8/00 SN. Classification changed from Thixotropic, isohyperthermic Typic Hydrudands.