LOCATION WAIALUA HIEstablished Series
TAXONOMIC CLASS: Very-fine, mixed, superactive, isohyperthermic Pachic Haplustolls
TYPICAL PEDON: Waialua silty clay - irrigated sugarcane. (Colors are for moist soil unless otherwise noted. Textures shown are "apparent field textures.")
Ap--0 to 12 inches; dark reddish brown (5YR 3/3) silty clay, dark reddish brown (5YR 3/2) moist; moderate medium and coarse subangular blocky structure; very hard, firm, very sticky and very plastic; many fine roots; common very fine and fine pores; thin layer of moderate very fine and fine granules on surface; common fine black concretions; strong effervescence with hydrogen peroxide; neutral (pH 6.7); clear wavy boundary. (5 to 15 inches thick)
B21--12 to 20 inches; dark reddish brown (5YR 3/3) silty clay, dark reddish brown (5YR 3/2) moist; moderate fine and medium subangular blocky structure; very hard, friable, very sticky and very plastic; many fine and medium roots; common fine and medium tubular pores; few fine black concretions; strong effervescence with hydrogen peroxide; slightly acid (pH 6.4); clear wavy boundary. (6 to 8 inches thick)
B22--20 to 30 inches; reddish brown (5YR 4/3) silty clay, dark reddish brown (5YR 3/3) moist; weak medium and coarse subangular blocky structure; very hard, friable, very sticky and very plastic; many fine roots; many fine tubular pores; common thin clay films in pores; few black concretions; strong effervescence with hydrogen peroxide; slightly acid (pH 6.4); clear wavy boundary. (8 to 12 inches thick)
B23--30 to 38 inches; dark reddish brown (5YR 3/4) silty clay, dark reddish brown (5YR 3/3) moist; common medium distinct dark red (2.5YR 3/6) mottles; weak medium and coarse subangular blocky structure; very hard, friable, very sticky and very plastic; many fine roots; many fine tubular pores; thin patchy clay films in pores and on faces of peds; many fine black concretions; black stains 2 to 5 mm. wide; strong effervescence with hydrogen peroxide; slightly acid (pH 6.4); clear smooth boundary. (6 to 10 inches thick)
C--38 to 55 inches; dark reddish brown (5YR 3/4) silty clay, dark reddish brown (5YR 3/3) moist; common medium distinct dark red (2.5YR 3/6) mottles; weak coarse subangular blocky structure; very hard, friable, very sticky and very plastic; few fine roots; common fine tubular pores; few fine black concretions; black stains 2 to 5 mm.; slight effervescence with hydrogen peroxide; slightly acid (pH 6.4).
TYPE LOCATION: Honolulu County, Hawaii; Waialua Agricultural Company field number Ranch 3, about 100 feet east of the plantation road between Gay 1 and Ranch 3 and 1,300 feet south of Farrington Highway near the town of Waialua.
RANGE IN CHARACTERISTICS: Fine black concretions are commonly throughout the sola. The soils are slightly acid or neutral. The highly weathered cobbles and pebbles in the soil range from 5 to 30 percent by volume. Average annual soil temperature is about 73 degrees F. No horizon is dry for more than 90 cumulative days during the year. Hue ranges from 5YR to 10YR throughout the solum.
The A horizon has value 2 or 3 dry, 3 or 4 moist, and chroma of 1 or 2 moist and 2 through 4 dry.
The B horizon has weak to moderate structure.
COMPETING SERIES: These are the Haleiwa, Honouliuli, Hoolehua, Waihuna, and Waipahu series. Haleiwa soils lack mottles and are sticky and plastic. Honouliuli soils have moderate slickensides and lack mottles. Waihuna soils have mean annual soil temperature of less than 71.6 degrees F. Waipahu soils have prismatic structure in the B horizon, deeply grooved slickensides in the lower part of the B horizon and lack mottles.
GEOGRAPHIC SETTING: Waialua soils are on fans at elevations of 10 to 100 feet. Slope is 0 to 30 percent. The soils formed in alluvium from basic igneous rocks. Average annual rainfall is 25 to 50 inches. Mean annual temperature is 73 degrees F., average January temperature is 70 degrees F., and average July temperature is 76 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Honouliuli soils and the Kaena and Kawaihapai soils. Kaena soils are dominated by montmorillonite clay. Kawaihapai soils have a fine-loamy control section and lack mottles.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow to medium runoff; moderate permeability.
USE AND VEGETATION: Irrigated sugarcane pasture and truck crops. Natural vegetation is koa haole (Leucaena glauca), cocklebur (Xanthium saccharatum), swollen fingergrass (Chloris inflata), sandbur (Cenchrus echinatua), and uhaloa (Waltheria indica).
DISTRIBUTION AND EXTENT: Mainly in Ewa, Kahuku, Waialua, and Waimanalo areas of Oahu, Hawaii. The soils are of small extent comprising about 5,500 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Soil Survey, Territory of Hawaii, 1949.
OSED scanned by SSQA. Last revised by state on 3/78.