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Site IS10

Location: Murtoa


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

General Landscape Description: Valley flat of a gently undulating plain.
Geology: Quaternary Woorinen Formation: aeolian dune sand, calcareous clay.


Image: IS10 Landscape
IS10 landscape

Soil Profile Morphology:

Surface Soil
A10-15 cmDark greyish brown (2.5Y4/2); medium clay; cracking and self-mulching surface condition; weak fine subangular blocky structure; weak consistence dry; slightly sticky consistence wet; pH 8.4; sharp boundary to:
Subsoil

B2115-45 cmDark grey (10YR4/1); light medium clay; subplastic; weak fine subangular blocky structure; strong consistence dry; slightly sticky consistence wet; pH 9.0:

B2245-90 cmDark grey (10YR4/1); medium heavy clay; subplastic; weak fine subangular blocky structure; weak consistence dry; slightly sticky consistence wet; very few (<2%) soft carbonate segregations; pH 9.2; gradual boundary to:

B23190-115 cmDark grey (10YR4/1); medium heavy clay; plastic; weak coarse subangular blocky structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 9.2:

B232115-125 cmDark grey (10YR4/1); medium heavy clay; plastic; weak coarse subangular blocky structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 9.1; gradual boundary to:

B31125-150Greyish brown (2.5YR5/2) light medium clay; plastic; weak subangular blocky structure; strong consistence dry; moderately sticky consistence wet; pH 9.2; gradual boundary to:

B32150-185Greyish brown (2.5YR5/2) light medium clay; plastic; weak subangular blocky structure; strong consistence dry; moderately sticky consistence wet; pH 9.0; gradual boundary to:

B33k185-210Light grey (10YR7/2) with (10YR6/3) mottles; light clay; plastic; weak subangular blocky structure; strong consistence dry; slightly sticky consistence wet; common (10-20%) soft and hard carbonate segregations; pH 9.2; gradual boundary to:

B34k210-220Light grey (10YR7/2) with (10YR6/6) mottles; light clay; plastic; moderate coarse subangular blocky structure; strong consistence dry; slightly sticky consistence wet; common (10­20%) soft carbonate segregations; pH 9.0.


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
0–15
8.4
NA
0.19
0.01
27.4
6.2
3.1
0.3
NA
NA
NA
24.4
12
13
8
63
B21
15–45
9.0
NA
0.18
0.02
26.7
8.1
2.0
2.6
NA
NA
NA
27.6
10
15
9
65
B22
45–90
9.2
NA
0.48
0.06
19.8
10.6
1.9
7.0
NA
NA
NA
29.3
10
14
9
64
B231
90–115
9.2
NA
0.91
0.14
14.3
11.4
2.0
13.1
NA
NA
NA
33.5
7
13
9
66
B232
115–125
9.1
NA
1.11
0.17
NA
NA
NA
NA
NA
NA
NA
NA
7
13
9
63
B31
125–150
9.2
NA
NA
0.19
NA
NA
NA
NA
NA
NA
NA
NA
7
11
7
63
B32
150–185
9.0
NA
1.35
0.21
NA
NA
NA
NA
NA
NA
NA
30.5
12
14
8
56
B33k
185–210
9.2
NA
1.31
0.22
NA
NA
NA
NA
NA
NA
NA
28.3
11
12
7
53
B34k
210–220
9.0
NA
NA
0.23
NA
NA
NA
NA
NA
NA
NA
26.0
15
8
9
54
Note: NA=not assessed.

Management Considerations:
  • Cracking clay profile, high clay percentage but deceases in deep subsoil
  • Friable self mulching surface
  • Very high calcium percentage in surface and upper and mid subsoil (to 90cm)
  • Lighter coloured deep subsoil, poorer internal drainage
  • Subsoil is strongly sodic and salinity increases at depth, particularly below 90cm
  • Landform element, valley flat: poor site drainage
Profile Described By: John Martin, Nabil Badawy, Ron Cawood, Geoff Pope, John Galea, John Turner (1970).
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