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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

A10-20 cmDark brown (10YR3/3) clay loam, ferromanganiferous nodules are common, pH 4.8. Clear transition to:


A220-45 cmLight grey (10YR7/2), clay loam, sporadically bleached when dry, ferromanganiferous nodules are common. Sharp transition to:


Subsoil


B2145-70 cmPale brown (10YR6/3) medium clay, red mottles (2.5YR4/6), moderate blocky structure (10-20 mm), pH 6.2. Gradual transition to:


B2270+ cmYellowish 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

Soil pit MM388 graphs



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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