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Site IS23

Location: Riverside

Australian Soil Classification: Epicalcareous-Endohypersodic, Self-Mulching, Grey VERTOSOL

General Landscape Description: Plain.
Geology: Quaternary Coonambidgal Formation: fluvial to lacustrine clays and sands


Image: IS23  Landscape
IS23 Landscape


Soil Profile Morphology:

Surface Soil

A10-10 cmDark grey (10YR4/1); light clay; cracking and self-mulching surface condition; moderate subangular blocky structure; very strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 7.9; sharp boundary to:
Image: IS23 Profile
IS23 Profile
Subsoil

B210-55 cmGreyish brown (10YR5/2); light clay; plastic; moderate coarse prismatic structure strong consistence dry; moderately sticky consistence wet; very few (<2%) hard carbonate segregations; pH 8.2.

B3k55-115 cmPale olive (5Y6/3); medium clay; plastic; moderate coarse lenticular structure (slickensides); strong consistence dry; sticky consistence wet; few (2-10%) hard carbonate segregations; pH 8.6.



Soil Profile Characteristics:

Horizon
Sample Depth cm
pH
EC
dS/m
Sodium Chloride
%
Exchangeable Calcium
cmol-/kg
Exchangeable
Magnesium
cmol-/kg
Exchangeable Potassium
cmol-/kg
Exchangeable Sodium
cmol-/kg
Exchangeable Aluminium
mg/kg
Exchangeable Acidity
cmol-/kg
Field
Capacity
-30okPa
Permanent
Wilting
Point
-1500okPa
Coarse
Sand
%
Fine
Sand
%
Silt
%
Clay
%
H2O
CaCl2
A1
0–10
7.9
NA
0.42
0.07
18.3
7.5
2.1
1.4
NA
3.7
NA
21.6
8
29
10
50
B2
10–55
8.2
NA
1.28
0.25
17.3
12.6
1.1
3.4
NA
2.7
NA
22.9
7
23
4
61
B3k
55–115
8.6
NA
2.06
0.44
8.9
17.5
2
7.3
NA
2.3
NA
23.8
6
20
10
58
Note: NA=not assessed.

Management Considerations:
  • Cracking clay soil.
  • Alkaline profile.
  • Shallow to moderately deep surface soil, generally self mulching.
  • Subsoil is sodic, with high saline and magnesium levels in the deep subsoil.
  • Yellow hue (5Y) and pale colour in deep subsoil indicates reduced conditions, poor internal drainage.
  • Roots may penetrate upper subsoil, but difficult physical and chemical environment below 55 cm.
  • Landform element, plain; slow site drainage.

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