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LWA8

Location: Shelford

Australian Soil Classification: Vertic, Mottled-Subnatric, Grey SODOSOL

General Landscape Description: Gently undulating plain.
Site Description: Stubble paddock – controlled traffick trial.
Geology: Quaternary basalt.

Image:  LWA8&9 Landscape
LWA8 Landscape


Soil Profile Morphology:

Surface Soil

A10-12 cmDark greyish brown (10YR4/2) with rusty root channel mottling; fine sandy clay loam; hardsetting surface with some surface cracking; weak to moderate coarse blocky structure; upper part of horizon is better structured – moderate medium polyhedral structure; strong consistence dry; pH 5.1; sharp change to:

Image:  LWA8 profile
LWA8 Profile
A2

NOTE: In some areas an A2 (12-25 cm) is present that can be as deep as 30 cm. Light brownish grey (10YR6/2) with dark greyish brown (10YR4/2) mottles; fine sandy clay loam; contains a few (2-5%) ferro-manganiferous nodules in patches (2-5 mm).
Subsoil

B2112-40 cmDark grey (10YR4/1) with many (40%) dark yellowish brown (10YR4/6) diffuse mottles; medium clay; moderate very coarse prismatic, parting to moderate coarse blocky structure; strong consistence dry; pH 6.1; gradual change to:

B2240-80 cmDark grey (10YR4/1) with common (20%) yellowish brown (10YR5/6) mottles in patches; medium heavy clay; moderate coarse blocky structure; strong consistence dry; very few (<2%) fine (1-2 mm in size) ferro-manganiferous nodules; large slickensides present; some deep cracks in profile to around 80 cm deep; pH 8.0; gradual change to:

B2380-100 cmGreyish brown (2.5Y5/2); medium heavy clay; moderate coarse prismatic, parting to strong coarse to medium subangular blocky structure; firm consistence moist; very few (<2%) fine (1-2 mm in size) ferro-manganiferous nodules; slickensides present; pH 8.4; gradual change to:

B24100-130+ cmGreyish brown (2.5Y5/2) with many (40%) brownish yellow (10YR6/8) mottles; light medium clay; moderate coarse prismatic, parting to strong coarse medium lenticular structure; patches of fine sand with some layering; pH 8.5.


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

Soil Profile Characteristics:


pH


Salinity Rating
Surface
(A1 horizon)
Strongly Acidic
Low
Non Sodic
None
Subsoil
(B21 horizon)
Slightly Acidic
Low
Sodic
Strong
Deeper Subsoil
(at 70-100 cm)
Moderately Alkaline
Medium
Strongly Sodic
Strong

Image:  LWA8 Graphs
The pH in the surface is strongly acid. The pH in the subsoil is slightly acid, becoming moderately alkaline with depth.The salinity rating is low in both the surface and upper subsoil. The salinity rating increases to medium in the deeper subsoil.The surface soil is non sodic. The subsoil is sodic becoming strongly sodic with depth.The clay content in the surface is low and sharply increases at the surface / subsoil interface.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
(dS/m)
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-12
5.1
4.5
0.17
4.2
3.3
0.25
1.0
A2
12-25
5.4
4.4
0.11
3.1
2.9
0.11
1.1
B21
12-40
6.1
5.2
0.19
7.3
9.7
0.34
3.2
B22
40-70
8
7.2
0.51
0.07
8.4
13
0.3
5.9
B23
70-100
8.4
7.7
0.56
0.08
7.2
15
0.3
7.4
B24
100-130+
8.5
7.8
0.62
0.09
7.5
16
0.3
7.9


Horizon
Horizon Depth
(cm)
Total
Nitrogen
%
Oxidisable
Organic Carbon
%
Exchangeable Acidity
meq/100g
Exchangeable Aluminium
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
0-12
0.19
2.4
9.6
28
31.0
9.3
6
43
26
19
A2
12-25
0.1
1.3
5.5
27
27.6
8.0
4
46
28
19
B21
12-40
8.9
<10
43.3
20.7
3
31
21
42
B22
40-70
4.0
<10
47.7
22.2
2
25
23
49
B23
70-100
38.8
18.7
1
31
28
39
B24
100-130+
43.4
21.1


Profile Described By: Mark Imhof (January 2007).

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