SWSL388

Australian Soil Classification: Bleached-Mottled, ?, Grey CHROMOSOL (confidence level 3)
General Landscape Description: Level to gently undulating plain
Site Description: Flat
Land Unit: Wongan Plains
Geology: Quaternary basalt

General Land Unit Description: The unit consists of Grey Chromosols or Sodosols on the near level basalt plain in the Lake Wongan area to the north of Streatham. Minor areas of acidic soils also occur on these plains.

Soil Profile Morphology

Surface

A1	0-20 cm	Dark brown (10YR3/3) clay loam, ferromanganiferous nodules are common, pH 4.8. Clear transition to:
A2	20-45 cm	Light grey (10YR7/2), clay loam, sporadically bleached when dry, ferromanganiferous nodules are common. Sharp transition to:
Subsoil
B21	45-70 cm	Pale brown (10YR6/3) medium clay, red mottles (2.5YR4/6), moderate blocky structure (10-20 mm), pH 6.2. Gradual transition to:
B22	70+ cm	Yellowish brown (10YR5/4) medium clay, yellowish brown mottles (10YR5/8), moderate blocky structure (10-20 mm), pH 6.3.

Key profile features:

Strongly acidic topsoil
Bleached A2 horizon
Mottled subsoil
Ferromanganiferious are common

Soil Profile Characteristics:

-	pH	Salinity
Surface Soil (A1 Horizon)	Very Strongly Acid	Very Low
Subsoil (B21 Horizon)	Slightly Acid	Very Low

Chemical and Physical Analysis:

Horizon	Horizon Depth (cm)	pH (water)	EC dS/m


A1	0-20	4.8	0.07
A2	20-45
B21	45-70	6.2	0.07
B22	70+	6.3	0.1

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