LOCATION MOAULA HI
Inactive Series
Rev. HHS/RCH
07/2012
MOAULA SERIES
The Moaula series consists of deep, well drained soils that formed in material weathered from volcanic ash. Moaula soils are on uplands and have slopes of 0 to 35 percent. Mean annual rainfall is about 75 inches and mean annual temperature is about 70 degrees F.
TAXONOMIC CLASS: Hydrous, ferrihydritic, isothermic Acrudoxic Hydrudands
TYPICAL PEDON: Moaula silty clay loam - sugarcane. (Colors are for moist soils unless otherwise noted. All textures are "apparent field textures.")
Ap--0 to 9 inches; very dark brown (10YR 2/2) silty clay loam, dark yellowish brown (10YR 4/6) dry; strong medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and plastic; many roots; common very fine and fine pores; few firm and very firm dark red (2.5YR 3/6) 1 to 5 mm. nodules of volcanic ash; very strongly acid (pH 4.9); abrupt wavy boundary. (6 to 12 inches thick)
B21--9 to 17 inches; dark reddish brown (5YR 3/4) silty clay loam; moderate medium subangular blocky structure; friable, sticky, plastic and weakly smeary; many roots; many very fine pores; patchy thin gelatin-like coatings on faces of peds; few firm dark red (2.5YR 3/6) 7mm. nodules of volcanic ash; slightly acid (pH 6.5); clear wavy boundary. (6 to 10 inches thick)
B22--17 to 23 inches; dark reddish brown (5YR 3/3) silty clay loam; moderate fine and very fine subangular blocky structure; friable, slightly sticky, plastic and weakly smeary; many roots; many very fine and fine pores; few fine pebble-size dark red fragments of volcanic ash; thin gelatin-like coatings on faces of peds; slightly acid (pH 6.5); abrupt wavy boundary. (4 to 8 inches thick)
B23--23 to 31 inches; dark reddish brown (5YR 3/4) silty clay loam; moderate fine and very fine subangular blocky structure; friable, slightly sticky, plastic and weakly smeary; few roots; many very fine and fine pores; common firm and very firm dark reddish brown (2.5YR 3/4) 1/4- to 2-inch fragments of volcanic ash; slightly acid (pH 6.4); clear wavy boundary. (5 to 10 inches thick)
B24--31 to 40 inches; dark reddish brown (5YR 3/3) silty clay loam; moderate fine and very fine subangular blocky structure; friable, slightly sticky, plastic and weakly smeary; few roots; many very fine and fine pores; few firm and very firm dark reddish brown fine pebble-size fragments of volcanic ash; neutral (pH 6.6); clear wavy boundary. (7 to 11 inches thick)
B25--40 to 48 inches; dark reddish brown (5YR 3/4) silty clay loam; moderate fine and very fine subangular blocky structure; friable, sticky, plastic and weakly smeary; few roots; many very fine and fine pores; common patches of gelatin-like coatings on faces of peds; common firm and very firm dark reddish brown fine pebble-size fragments of volcanic ash; neutral (pH 6.8); abrupt wavy boundary. (5 to 10 inches thick)
B26--48 to 54 inches; dark reddish brown (5YR 3/4) silty clay loam; common fine distinct yellowish brown (10YR 5/6) mottles; moderate fine and very fine subangular blocky structure; friable, slightly sticky, plastic and weakly smeary; few roots; many very fine and fine pores; common firm and very firm dark reddish brown fine pebble-size fragments of volcanic ash; common patches of gelatin-like coatings on faces of peds; neutral (pH 6.8); abrupt wavy boundary. (4 to 8 inches thick)
B27--54 to 65 inches; dark reddish brown (5YR 3/4) silty clay loam; few fine distinct yellowish brown (10YR 5/6) mottles; moderate fine and very fine subangular blocky structure; friable, slightly sticky, plastic and moderately smeary; few roots; common patches of gelatin-like coatings on faces of peds; neutral (pH 6.8); abrupt smooth boundary. (9 to 12 inches thick)
B28--65 to 74 inches; yellowish red (5YR 4/6) and dark brown (7.5YR 3/4) silty clay loam, common fine distinct dark reddish brown (2.5YR 3/3) mottles; weak fine and very fine subangular blocky structure; friable, sticky, plastic and moderately smeary; common very fine and fine pores; few patches of gelatin-like coatings on faces of peds; neutral (pH 6.7).
TYPE LOCATION: Island of Hawaii, Hawaii County, Hawaii; Punaluu Quadrangle - 19 degrees 08' 10" north latitude and l55 degrees 33' 55" west longitude; about 5 miles north of Naalehu town in field 632 of Hutchinson Sugar Company.
RANGE IN CHARACTERISTICS: Depth to bedrock is more than 60 inches. Hue of the solum ranges from 5YR through 10YR. The value and chroma of the A horizon are 2 or 3. The B horizon ranges from weakly to moderately smeary. In some pedons the lower part of the B horizon contains pockets that have strong subangular blocky structure. The B horizon dehydrates irreversibly, and forms dark brown or black, very hard, sand- and silt-size particles.
COMPETING SERIES: These are the
Kukaiau,
Maile,
Manahaa,
Niulii,
Ookala,
Paauhau,
Punohu, and Puu Oo series. Kukaiau soils lack mottles in the lower part of the B horizon. Maile soils have isomesic temperature and lack mottles in the lower part of the B horizon. Manahaa soils have a silt loam control section, are 20 to 40 inches deep over bedrock and have isomesic temperature. Niulii soils lack mottles in the lower part of the B horizon, and are 20 to 40 inches deep over bedrock. Ookala soils have firm consistence and strong subangular blocky structure in the B horizon, and have isohyperthermic temperature. Paauhau soils are free of mottles in the B horizon, and have isohyperthermic temperature. Punohu soils are silt loam in the upper part of the B horizon and have isomesic temperature. Puu Oo soils lack mottles in the B horizon and have isomesic temperature.
GEOGRAPHIC SETTING: The Moaula soils are on undulating to steep 0 to 35 percent low leeward slopes of Mauna Loa at elevations ranging from 1,300 to 1,900 feet. Average annual rainfall is 60 to 90 inches. Mean annual temperature is 70 degrees F.; average January temperature is 67 degrees F.; and average July temperature is 72 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Alapai and
Naalehu soils. Alapai soils are moderately smeary and dehydrate irreversibly into gravel-size particles. Naalehu soils have a mollic epipedon and isohyperthermic temperature.
DRAINAGE AND PERMEABILITY: Well drained; medium to slow runoff; moderately rapid permeability.
USE AND VEGETATION: Most of these soils are used for growing sugarcane. Natural vegetation is Christmasberry (Schinus terebinthiofolius), guava (Psidium guajava), joee (Stachytarpheta cayannensis), and kikuyugrass (Pennisetum clandestinum).
DISTRIBUTION AND EXTENT: This series is on the Island of Hawaii. It is inextensive with a total of 4,510 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Soil Survey, Territory of Hawaii, 1949.
REMARKS: The fragments of volcanic material described in the B horizon are more properly designated as cinders, lapilli or bombs than as volcanic ash.
OSED scanned by SSQA. Last revised by state on 5/78.
SERIES INACTIVATED 07/19/2012 fro the Final Correlation of HI801 (Island of Hawaii, Hawaii) extensive update
Moaula----------- HYDROUS, FERRIHYDRITIC, ISOTHERMIC ACRUDOXIC HYDRUDANDS
After extensive revision of the Mauna Loa landscape, the soils found in the area of MU MoC, MoD, and MoE , were found to be similar soils to the Alapai soil series with respect to the range in soil characteristics, geographic setting, and map unit concepts. Moaulu soils will be correlated to the Alapai soil series. ALAPAI----------HYDROUS, FERRIHYDRITIC, ISOTHERMIC TYPIC HYDRUDANDS
- Map units:
MoC Moaula silty clay loam, 0 to 10 percent slopes
MoD Moaula silty clay loam, 10 to 20 percent slopes
MoE Moaula silty clay loam, 20 to 35 percent slopes
- Respectively correlated to:
516 Alapai hydrous silty clay loam, 3 to 10 percent slopes
517 Alapai hydrous silty clay loam, 10 to 20 percent slopes
518 Alapai hydrous silty clay loam, 20 to 35 percent slopes
National Cooperative Soil Survey
U.S.A.