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SW47

Location: Toolong

Australian Soil Classification: Humose, Subnatric, Brown SODOSOL
General Landscape Description: Level plain
Site Description: Grazing paddock (dairy).
Mapping Unit: Unit 5 (Maher and Martin, 1987).
Geology: Tertiary sediments.


SW47 Landscape
SW47 Landscape


Soil Profile Morphology:

Surface Soil

A10-20 cmBlack (10YR2/1); fine sandy clay loam; weak to moderate coarse blocky, parting to medium fine blocky structure; weak consistence moist; pH 7.1; clear change to:
SW47 Profile
SW47 Profile
A220-30 cmPale brown (10YR6/3), conspicuously bleached; fine sandy clay loam; weak medium blocky structure; weak consistence moist; pH 6.7; clear change to:
Subsoil

B2130-45 cmDark yellowish brown (10YR4/4); light mediumclay; weak to moderate medium blocky, parting to fine blocky structure; weak consistence moist; contains a few (10-20%) ferruginous nodules (2-10 mm in size); pH 6.4; clear change to:
B2245-60 cmDark yellowish brown (10YR4/4); light medium clay; moderate medium polyhedral, parting to fine polyhedral structure; firm consistence moist; pH 6.0; gradual change to:
B2360-80 cmDark yellowish brown (10YR4/4) with many yellowish brown (30%) (10YR5/8) and a few yellowish red (5YR5/6) mottles; light medium clay; strong medium blocky, parting to moderate to strong fine blocky structure; shiny faced peds; firm consistence moist; pH 6.1; gradual change to:
B2480+ cmDark greyish brown (10YR4/2) with many strong brown (7.5YR5/8) and a few red (2.5YR4/8) and light grey (10YR7/1) mottles; light medium clay; strong medium blocky, parting to moderate to strong fine blocky structure; some dark stains (manganese?); pH 6.2:
D120+ cmWeathered sandstone.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Slightly Alkaline
Low
Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Low
Sodic
None1
Deeper subsoil
(at 80+ cm)
Slightly Acid
Low
Sodic
None
      1. Complete dispersion after remoulding.



      SW47 pH
      The surface is slightly alkaline. The subsoil is slightly acid.
      SW47 Salinity
      The surface is slightly alkaline. The subsoil is slightly acid.
      SW47 Sodicity
      The profile is sodic throughout.
      SW47 Clay
      The clay content increases markedly at 30 cm depth.


Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
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
0-20
7.1
6.2
0.13
6.9
1.9
0.4
1.6
24
36
8
22
24
13.6
A2
20-30
6.7
5.5
0.12
2.2
1.2
<0.1
0.6
30
39
8
21
16.6
8.2
B21
30-45
6.4
5.5
0.18
3.2
3
<0.1
1
20
23
5
51
27.4
18
B22
45-60
6
5.5
0.21
3.1
4.1
0.1
0.8
12
13
5
69
35.1
24.5
B23
60-80
6.1
5.7
0.2
3.1
4.9
0.1
0.7
7
12
5
75
39
27.3
B24
80+
6.2
5.7
0.16
2.9
5
<0.1
0.7
8
15
6
71
37.5
25.9




Profile Described By: Mark Imhof and Austin Brown, August 1998.
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