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GL28

Location: Bahgallah

Australian Soil Classification: Bleach-Mottled, Eutrophic, Brown KUROSOL (confidence level 1)
General Landscape Description: Gently undulating plains
Site Description: Lower slope, 4% slope.
Land Unit: Follet Dunes and Plains
Geology: Quaternary aeolian

General Land Unit Description: The majority of this land unit falls south of the Kanawinka fault. This land unit comprises areas with deep sand deposits. The residual landscape is thought to be influenced by the retreat of the Murray Sea which left stranded beach ridges oriented south west–north east. These were subsequently covered by superficial sand sheets in later depositional phases, which formed the landscape seen today.

The major landforms in this land unit are dunes and swales. Podosols and Kurosols or Chromosols are the major soil types found on the dunes and rises. Podosols are soils with a ‘coffee rock’ layer (refer to photograph). The Kurosols or Chromosols tend to have a deep sandy topsoil over the clay. The common soil types on the swales are black cracking clay (Vertosols) or Grey Sodosols. Some Ferric Kurosols or Chromosols can also occur on the swales or lower slopes of the dunes.


Soil pit GL28 auger



Soil Profile Morphology

A10-10 cmVery dark greyish brown (10YR3/2); sand; apedal; pH 7.1; changes to:


A2110-30 cmDark grey (10YR4/1), bleached (10YR6/1d); sand; apedal, pH 6.0; changes to:



A2230-50 cmGrey (10YR4/1); bleached (10YR7/1d); sand; apedal; pH 5.7; changes to:



Subsoil

B250-80 cmDark brown (10YR3/3), with many distinct red, orange and yellow mottles; sandy clay loam; weak to massive sub-angular blocky structure; pH 5.0; changes to:


B380-120 cmYellowish brown (10YR5/4), with many distinct red and yellow mottles from weathered sediments; sandy clay loam; weak to massive structure; pH 5.0.


Key profile features:
  • Strong texture contrast between topsoil and subsoil
  • Deep sandy topsoil
  • Strongly acidic topsoil
  • Mottled subsoil


Soil Profile Characteristics:

-

pH
Salinity
Surface Soil
(A1 horizon)
Slightly Alkaline
Medium
Non-Sodic
None
Subsoil
(50-80 cm)
Strongly Acid
Medium
Strongly Sodic
None
Deeper Subsoil
(80 -120 cm)
Strongly Acid
Medium
Strongly Sodic
None


Soil pit GL28 graphs


Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
Organic Carbon
%
Total
Nitrogen
%
Exchangeable Aluminium
ppm
Exchangeable Acididty
meq/100g
Exchangeable Cations
Coarse Sand
(0.2-2.0 mm)
%
Fine Sand
(0.02-0.2 mm)
%
Silt
(0.002-0.02 mm)
%
Clay
(<0.002 mm)
%
Field Capacity
% w/w
Wilting Point
% w/w
Ca
Mg
K
Na
meq/100g
A1
0-10
7.1
7.0
0.32
1.2
<0.05
2
0.3
0.2
0.1
69
26
1
6
4.6
4.3
A21
10-30
6.0
5.5
0.16
<10
2
0.57
00.19
0.12
0.38
61
34
3
4
2.9
1.0
A22
30-50
5.7
5.2
0.12
<10
2.6
0.89
0.3
0.1
0.31
56
37
4
3
3.9
1.2
B2
50-80
5.0
4.3
0.17
180
12
0.95
2.3
0.22
0.59
44
29
3
22
14.5
8.7
B3
80-120
5.0
4.2
0.17
200
11
0.97
3.8
0.22
0.7
49
22
2
28
16.8
10.6


Profile Described By: Natalie Baxter and Grant Boyle, 2nd October 2000.
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