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IS18

Location: Drung Drung

Australian Soil Classification: Hypocalcic, Subnatric, Brown SODOSOL

Northcote Factual Key: Db1.13
Great Soil Group: No suitable group.
Soil Type: Drung Sandy Clay Loam.

General Landscape Description: Anastomotic plain.
Geology: Quaternary Shepparton Formation: fluvial silt, sand and minor gravel.

Image: IS18 Llandscape
IS18 Landscape


Soil Profile Morphology:

Surface Soil

A10-10 cmBrown (7.5YR4/3); sandy clay loam; hardsetting surface condition; weak coarse granular structure; very strong consistence dry; pH 7.4; sharp and smooth boundary to:

Subsoil

B21110-40 cmBrown (7.5YR4/4); light clay; subplastic; moderate coarse prismatic structure; very strong consistence dry; sticky consistence wet; pH 8.4.

B21240-60 cmBrown (7.5YR4/4); heavy clay; subplastic; moderate coarse prismatic structure; very strong consistence dry; sticky consistence wet; pH 9.4; clear and smooth boundary to:

B2260-90 cmPale brown (10YR6/3) with yellowish red (5YR5/8) mottles; medium clay; plastic; weak coarse subangular blocky structure; very strong consistence dry; sticky consistence wet; very few (<2%) hard carbonate segregations; pH 9.1; gradual boundary to:

B2390-120 cmLight brownish grey (10YR6/2); heavy clay; plastic; weak coarse subangular blocky structure; very strong consistence dry; sticky consistence wet; very few (<2%) hard carbonate segregations; pH 9.1.

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
%
Exchangeable Acidity
cmol-/kg
Organic
Carbon
%
Permanent
Wilting
Point
-1500okPa
Coarse
Sand
%
Fine
Sand
%
Silt
%
Clay
%
A1
0–10
7.4
0.07
0.01
9
1.3
1.4
0.1
0.07
3.7
0.79
9.7
14
46
12
27
B211
10–40
8.4
0.64
0.03
13.9
17.5
1.9
5.7
0.09
3.9
0.63
30
3
14
7
72
B212
40–60
9.4
0.59
0.05
6.8
15.4
1.7
6.3
0.03
0.23
23.1
5
26
11
53
B22
60–90
9.1
0.86
0.12
5.5
14.4
1.5
6.9
0.02
0.15
21.8
5
34
11
47
B23
90–120
9.1
0.94
0.12
5
12.6
1.4
7.2
0.02
0.07
20.5
7
35
12
43
B24
120–150
9.1
1.01
0.15
21.2
5
31
12
48
B25
150–185
9.2
1.02
0.14
19.5
5
32
11
43
B26
185–215
9.2
0.95
0.15
19.9
3
38
9
42
B27
215–245
8.9
0.77
0.14
17.2
1
46
10
42
B28
245–275
8.7
0.69
0.13
17.3
2
46
11
41

Management Considerations:
  • Very strong texture contrast (27% to 72% clay), clay decreasing with depth.
  • Alkaline soil, slightly decreasing at depth, high level of nutrients in upper subsoil (B22 horizon).
  • Thin surface horizon with, poor structure and high fine sand component.
  • Subsoil is sodic, becoming strongly sodic with depth and high salinity values below 45cm.
  • Upper subsoil has strong colour and no mottling, indicating little restrictive water and air movement.
  • Subsoil is pale and mottled below 60cm, indicating some restricted drainage.
  • Landform element, plain; slow site drainage, unless near drainage line.

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