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Site SW27

Location: Bostock Creek.Australian Soil Classification: Vertic (& Ferric), Subnatric, Grey SODOSOL.
General Landscape Description: Grazing paddock (dairy).Mapping Unit: Unit 113 (Maher and Martin, 1987).
Site Description: Lower slope within gently undulating hills.Geology: Quaternary - Newer volcanics (scoria).

Image:  SW27 Landscape
Site 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
Site 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 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); pH 6.5; gradual change to:

B2270-100 cmGreyish brown (2.5Y5/2) with 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.

Key Profile Characteristics:


pH

Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Low-Medium
Non-Sodic
Subsoil
(B21 horizon)
Slightly Acid
Low
Sodic
Deeper subsoil
(at 70-100 cm)
Neutral
Low
Sodic

Image:  SW27 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
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)
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
39
18
6
39
22
19
A12
15-40
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
26
32
3
14
8
72
C
100+

Profile Described By: Mark Imhof and Austin Brown, August 1988.
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