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WCSS09

Location: Mirranatwa

Australian Soil Classification: Bleached-Mottled, Eutrophic, Brown CHROMOSOL (thick surface horizon)
General Landscape Description: Rolling low hills - dissected Tertiary peneplain
Site Description: Grazing paddock – never limed. Paired catchment experimental site.

WCSS09 Landscape
WCSS09 Landscape



Soil Profile Morphology:

Surface Soil

A10-17 cm Very dark greyish brown (10YR3/2); loam; weak coarse to medium blocky, parting to moderate coarse to medium granular structure; very weak to weak consistence, dry; pH 5.8; clear change to:
WCSS09 Profile
WCSS09 Profile


WCSS09 Profile 2
Soil pit 2-3 m depth
A217-50 cmPale brown (10YR6/3), conspicuously bleached (10YR 7/1 dry); light fine sandy clay loam; massive ; firm (dry) consistence; fine to coarse macropores common; pH 6.1; clear change to:
Subsoil
B2150-90 cmYellowish brown (10YR5/6) with yellowish red (5YR 5/6) mottles and brown 10YR 4/3 cutans; medium clay; weak coarse prismatic, parting to strong coarse subangular blocky (dark faces), further parting to strong medium to fine polyhedral structure; shiny-faced peds; very firm to strong consistence (dry); few (2%) soft (2-3 mm) manganiferous segregations and ferromanganiferous nodules (2-3 mm size); surface material down cracks to 100 cm; pH 6.7; gradual change to:
B2290-130 cmYellowish brown (10YR5/6) with greyish brown (10YR5/2), grey (10YR6/1) and red (2.5YR4/6) mottles; heavy clay; weak medium prismatic, parting to strong medium to fine subangular blocky structure; shiny-faced peds; very firm to strong consistence (dry); pH 6.4; gradual change to:
B23130-150+ cmGrey (10YR6/1) with brownish yellow (10YR6/8) and red (2.5YR5/6) mottles; medium clay; strong coarse to medium subangular blocky structure; very few (<1%) ferromanganiferous nodules; pH 6.6.


Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoils (B21) horizon.
  • Conspicuously bleach subsurface (A2) horizon.
  • Well structured subsoil horizons (with shiny-faced peds).


Soil Profile Characteristics:

-

pH
Salinity
Surface Soil
(A1 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Subsoil
(50-90 cm)
Slightly Acid
Very Low
Non-Sodic
None
Deeper Subsoil
(130-150 cm)
Slightly Acid
Low
Non-Sodic
None


WCSS09 Graphs

Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
Organic Carbon
%
Exchangeable Aluminium
ppm
Exchangeable Acididty
meq/100g
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
0-17
5.8
5.2
0.09
3.2
11
10
3.4
1.6
0.23
0.14
14
36
17
16
22.2
8
A2
17-50
6.1
5.1
<0.05
4
1.5
1.1
0.22
<0.05
16
49
16
14
18.3
4.4
B21
50-90
6.7
6.0
0.15
7.8
4.3
7
1.3
0.13
4
54
6
70
41.4
23.1
B22
90-130
6.4
6.0
0.36
6.6
3.2
7.2
0.94
0.08
4
15
9
66
41.7
23
B23
130-150+
6.6
6.1
0.45
5.5
2.3
6.4
1.3
0.07
9
26
11
52
58.9
18.3
300
5.7
5.4
0.83

Profile Described By: Mark Imhof and David Rees, 30th March 2010.
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