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WCFA12

Location: Litchfield

Australian Soil Classification: Sodic, Calcic, Brown DERMOSOL


General Landscape Description: Flat Plain.
Site Description: Linear gilgai. Cropping paddock.
Geology: Parna – Woorinen Formation.

Image: WCFA12 landscape
WCFA12 Landscape

Soil Profile Morphology:

Surface Soil
Image: WCFA12 Profile
WCFA12 profile
A10-15 cmVery dark brown (10YR2/3); very fine sandy clay loam; moderate fine sub-angular blocky structure; rough fabric; weak consistence dry; pH 7.9; wavy change to:
Subsoil
B2115-45 cmDark yellowish brown (10YR3/4); light medium clay; strong medium sub-angular and angular blocky structure; rough to smooth fabric; very firm consistence dry; contains very few medium soft calcareous segregations; pH 8.6; clear and wavy change to:
B22k45-80 cmYellowish red (5YR5/6); light medium clay; strong medium prismatic, parting to strong fine angular blocky structure; rough to smooth fabric; strong consistence dry; soft calcareous segregations common, with very few fine calcareous and manganiferous nodules; highly calcareous; pH 9.3; changing to:
B2380-105+ cmLight yellowish brown (10YR6/4); medium clay; moderate medium prismatic, parting to medium fine angular blocky structure; rough to smooth fabric; strong consistence dry; contains very few fine calcareous and manganiferous nodules; moderate to highly calcareous; pH 9.2.


Soil Profile Characteristics:


pH
Salinity Rating
Surface
(A1 horizon)
Slightly Alkaline
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Strongly Alkaline
Medium
Strongly Sodic
Slight1
Deeper Subsoil
(at 80-105 cm)
Very Strongly Alkaline
High to Very High
Extremely Sodic
None2
1 Strong dispersion after remoulding. 2 Slight dispersion after remoulding.

Image: WCFA12 graphs
    The surface is slightly alkaline. The upper subsoil is strongly alkaline becoming very strongly alkaline with depth.
    The salinity rating in the surface is low. The upper subsoil has a medium salinity rating and the deeper subsoil has a high to very high salinity rating.
The surface is non-sodic. The upper subsoil is strongly sodic becoming extremely sodic with depth. The Boron levels increase with depth, becoming high in the subsoil.The clay content increases markedly at the surface / subsurface boundary.
Chemical and Physical Analysis:

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-15
7.9
7.5
0.16
-
24
4.6
2
0.7
B21
15-45
8.6
7.9
0.49
0.04
17
12
1.2
6.6
B22k
45-80
9.3
8.7
1.1
0.1
6.6
17
1.7
14
B23
80-105
9.2
8.7
1.3
0.14
5.6
17
1.8
16

Horizon
Horizon Depth
(cm)
Oxidisable Organic Carbon
%
Total
Nitrogen
%
Available
Boron
mg/kg
Field
Capacity
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2-2.0 mm)
Fine Sand
(0.02-0.2 mm)
Silt
(0.002-0.02 mm)
Clay
(<0.002 mm)
A1
0-15
1.1
0.1
2.7
29.5
15.2
22
27
11
37
B21
15-45
0.66
0.055
8.5
35.2
25.5
18
20
8
50
B22k
45-80
0.3
<0.05
30
55.3
30.7
10
13
7
57
B23
80-105
27

Profile Described By:
Nathan Robinson, Grant Boyle and John Martin (October 2006).
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