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SW27

Location: Bostock Creek.

Australian Soil Classification: Vertic (& Ferric), Subnatric, Grey SODOSOL.

Map Unit: Map Unit 113 (Maher and Martin, 1987).

General Landscape Description: Grazing paddock (dairy).
Site Description: Lower slope within gently undulating hills.
Geology: Quaternary - Newer volcanics (scoria).

Image:  SW27 Landscape
SW27 Landscape


Soil Profile Morphology:

Surface Soil

A110-15 cm Black (10YR2/1); fine sandy clay loam; weak to moderate medium polyhedral, parting to moderate fine polyhedral structure; firm to very firm consistence dry; weak-firm consistence (moist); pH 6.1; gradual change to:

Image:  SW27 Profile
SW27 Profile
A1215-40 cmVery dark grey (10YR3/1); fine sandy clay loam; moderate medium polyhedral, parting to moderate fine polyhedral structure; weak-firm consistence moist; pH 5.8; abrupt change to:

A240-50 cmBrown (10YR5/3), conspicuously bleached (7.5YR7/2d); fine sandy clay loam; apedal; contains very many (> 50%) ferruginous nodules (2-6 mm in size); pH 6.5; sharp change to:
Subsoil

B2150-70 cmVery dark greyish brown (10YR3/2) becoming dark greyish brown (2.5Y4/2) with depth, with yellowish brown (10YR5/6) mottles; heavy clay; moderate very coarse prismatic, parting to moderate coarse to medium polyhedral structure; strong consistence dry; contains some dark stains; pH 6.5; gradual change to:

B2270-100 cmGreyish brown (2.5Y5/2) with many yellowish brown (10YR5/8) mottles; heavy clay; strong very coarse prismatic, parting to coarse prismatic and very coarse blocky structure; strong consistence dry; many slickensides present; pH 7.0; abrupt change to:

C100+ cmWeathered ash.


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

Soil Profile Characteristics:


pH


Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Low-Medium
Non-Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Sodic
None
Deeper subsoil
(at 70-100 cm)
Neutral
Very Low
Sodic
None

Image:  SW27 Graphs
The surface soil and upper subsoil is slightly acid. The deeper subsoil is neutral.The salinity rating in the surface soil is low to moderate. The subsoil is very low.The surface is non-sodic. The subsoil is sodic.The clay content increases dramatically at the subsoil boundary (50 cm depth).

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
(dS/m)
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A11
0-15
6.1
5.7
0.29
0.02
14
2.3
0.6
0.1
A12
15-40
5.8
5
0.09
6.7
2.1
0.1
0.1
A2
40-50
6.5
5.6
0.08
4.5
2.2
<0.1
0.2
B21
50-70
6.5
5.8
0.18
5.8
9.6
0.2
1.4
B22
70-100
7
6.1
0.18
4.7
11
0.2
2.4
C
100+

Horizon
Horizon Depth
(cm)
Oxidisable Organic Carbon
%
Total
Nitrogen
%
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)
A11
0-15
5.5
0.47
39
18
6
39
22
19
A12
15-40
3.0
0.19
34
11
5
46
22
20
A2
40-50
26
11
29
33
15
19
B21
50-70
56
35
4
12
5
73
B22
70-100
56
32
3
14
8
72
C
100+

Profile Described By: Mark Imhof and Austin Brown (May 1988).
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