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GL83

Location: Winnap

Australian Soil Classification: Ferric-Sodic, Mesotrophic, Brown CHROMOSOL (confidence level 2)
General Landscape Description: Rolling low hills
Site Description: Mid to lower slope
Land Unit: Dundas Sedimentary
Geology: Tertiary sedimentary

General Land Unit Description: This land unit occurs on dissected slopes leading to valleys, predominantly in the southern portion of the study area. The dominant soil type is a Brown Chromosol, commonly with a ferric horizon above the occasionally sodic subsoil. The landform, along with the high percentage of ferruginous nodules above the clay are the major restrictions to land use. The sandy topsoil is susceptible to wind erosion.

Soil pit GL83 auger


Key profile features:

  • Strong texture contrast between topsoil and subsoil
  • Strongly acidic topsoil
  • Bleached A2 horizon
  • Mottled subsoil
  • Sodic subsoil at depth
  • Kaolinite at depth
Soil pit GL83 graphs


Soil Profile Characteristics:

-

pH
Salinity
Surface Soil
(A1 horizon)
Very Strongly Acid
Low
Non-Sodic
None
Subsoil
(46-60 cm)
Moderately Acid
Very Low
Non-Sodic
None1
Deeper Subsoil
(90 -135 cm)
Slightly Acid
Very Low
Sodic
None
1 Compete dispersion after remoulding (20 hrs).

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
4.6
4.0
0.08
4.2
0.28
67
13
1.0
0.63
0.27
0.13
16
49
14
13
24.7
8.2
A2
10-32
5.1
4.4
<0.05
44
6.7
0.81
0.47
0.07
0.15
15
52
15
14
19.1
5.4
B21
46-60
5.9
4.8
0.07
23
11
2.3
5.3
0.18
0.72
6
20
5
66
35.7
23.7
B22
60-90
6.3
5.6
0.09
<10
12
2.4
7.8
0.22
1.1
3
9
6
82
46.6
30.2
B23
90-135
6.5
6.0
0.11
9.7
2.0
8.0
0.18
1.6
5
10
12
72
43.7
27




Profile Described By: Natalie Baxter and Grant Boyle, 8th October 2000.
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