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IS20

Location: Drung Drung

Soil Type: Haven Sandy Clay Loam

Australian Soil Classification: Hypocalcic, Subnatric, Grey SODOSOL

Northcote Factual Key: Dy 2.33
Great Soil Group: solodic soil

General Description: Terrace flat.
Geology: Quaternary Coonambidgal Formation: fluvial to lacustrine clays and sands

Image: IS20 Llandscape
IS20 Landscape

Soil Profile Morphology:

Surface Soil

A10-5 cmGreyish brown (10YR5/2) sandy clay loam; plastic; hardsetting surface condition; weak coarse blocky structure; strong consistence dry, slightly sticky consistence wet; pH 6.6; sharp and smooth change to:
Image: IS20 Profile
IS20 Profile
Subsoil

B215-30 cmGrey (10YR5/1) light clay; subplastic; weak coarse subangular blocky structure; strong consistence dry, moderately sticky consistence wet; pH 7.5; gradual change to:

B2230-60 cmGrey (5Y5/1) light clay; subplastic; weak coarse blocky structure; strong consistence dry, moderately sticky consistence wet; contains a trace (<2%) amount of hard carbonate; pH 8.9; gradual and smooth change to:

B2360-85 cmGrey (5Y5/1) light clay; subplastic; weak coarse blocky structure; strong consistence dry, moderately sticky consistence wet; contains a trace (<2%) amount of hard carbonate; pH 8.0:

B2485-100 cmGrey (5Y5/1) medium clay; subplastic; weak coarse blocky structure; strong consistence dry, moderately sticky consistence wet; contains a trace (<2%) amount of hard carbonate; pH 7.7.
Chemical and Physical Analysis:


Horizon
Sample
Depth cm
pH
H2O
EC
dS/m
Sodium Chloride
%
Exchangeable Calcium
cmol-/kg
Exchangeable
Magnesium
cmol-/kg
Exchangeable Potassium
cmol-/kg
Exchangeable Sodium
cmol-/kg
Total
Nitrogen
%
Organic
Carbon
%
Bulk Density
Exchangeable Acidity
cmol-/kg
Field
Capacity
-30okPa
Permanent
Wilting
Point
-1500okPa
Coarse
Sand
%
Fine
Sand
%
Silt
%
Clay
%
A1
0–5
6.6
0.15
0.03
5
7.3
0.8
1
0.1
5.0
1.22
6
23.5
12.6
6
46
15
33
B21
5–30
7.5
0.19
0.03
9.1
13.8
0.9
2.9
0.06
0.49
1.51
2.9
19.1
4
27
13
54
B22
30–60
8.9
0.46
0.06
9.8
15.1
1
4.1
0.05
0.48
1.45
4.2
19.8
3
24
16
55
B23
60–85
8.0
0.9
0.1
9.8
15.1
1.1
4.6
0.04
0.38
1.49
3
19.8
4
24
17
55
B24
85–100
7.7
2.16
0.12
11.6
16.2
1.1
5.4
0.02
0.22
1.51
2.4
21.7
2
20
17
58
B25
100-150
8.5
0.81
0.12
9.2
15.5
1.2
5.3
0.02
0.11
2.2
21.6
4
22
16
56
B26
150-215
9.0
0.77
0.12
6
18
12
58
Note: NA=not assessed.

Management Considerations:
  • Texture contrast soil, possible cracking clay (vertosol)
  • Slightly acid to neutral thin surface soil over neutral to alkaline subsoil
  • Hard setting, coarsely structured surface soil, not ideal for plant establishment
  • Subsoil has vertic properties, including subplasticity (feels lighter than lab data suggests), limited obvious structure
  • Subsoil is slightly sodic (subnatric), more sodic at depth and high magnesium
  • Yellow hue (5Y) would suggest reducing conditions , poor internal drainage as clay in subsoil expands
  • Landscape element, terrace flat; slow site drainage unless near drainage line

Profile Described By: John Martin, Nabil Badawy, Ron Cawood, Geoff Pope, John Galea, John Turner (1970).

Reference: "Major Agricultural Soils of the Wimmera Irrigation Area". John Martin, Mark Imhof, Lourey Ruth, Rob Nink, Karen DePlater, Paul Rampant, Sonia Thompson, S. Alexander. Department of Natural Resources and Environment, Victoria. 1996.
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