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SWSL883

Australian Soil Classification: Bleach-Sodic, ?, Brown CHROMOSOL (confidence level 3)
General Landscape Description: Gently undulating plain
Site Description: Open depression
Land Unit: Ardonachie Basalt
Geology: Quaternary basalt

General Land Unit Description: The undulating rises west of Macarthur, consists mainly of Brown Chromosols. The characteristics of the Chromosols vary. Some soils may have bleached subsurface horizons or be sodic at depth and there may be a ferric horizon. Sandy Mottled Yellow Chromosols are commonly found in the western portion of the unit.


Soil Profile Morphology

Surface

A10-25 cmVery dark greyish brown (10YR3/2) fine sandy clay loam, pH 5. Clear transition to:

A225-30 cmLight grey (10YR7/2), sporadically bleached fine sandy clay loam. Sharp transition to:

Subsoil
B2130-60 cmYellowish brown (10YR5/4) heavy clay, yellowish brown mottles, pH 6.3. Gradual transition to:

B2260-75 cmLight brownish grey (2.5Y6/2) medium clay, brownish yellow mottles (10YR6/8), fragments are common (200-600 mm), pH 6.8.



Soil pit MM883 graphs


Key profile features:
  • Strongly acidic topsoil
  • Bleached A2 horizon
  • Mottled subsoil
  • Subsoil sodic at depth
  • Subsoil dispersive when worked when wet


Soil Profile Characteristics:
-

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


Chemical and Physical Analysis:

Horizon
Horizon Depth
(cm)
pH
(water)
EC
dS/m
A1
0-25
5.4
0.1
A2
25-30
B21
30-60
6.3
0.08
B22
60-75
6.8
0.1
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