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Site SW26

Location: Camperdown.Australian Soil Classification: Humose, Calcic, Black DERMOSOL (clayey).
General Landscape Description: Level plain.Mapping Unit: Unit 2 (Maher and Martin, 1987).
Site Description: Grazing paddock (dairy).Geology: Quaternary Newer volcanics (scoria).

Image:  SW26 Landscape
Site SW26 landscape


Soil Profile Morphology:

Surface Soil

A10-10 cm Black (10YR2/1); light clay; strong medium polyhedral structure; very firm consistence dry; pH 6.7; clear change to:

Image:  SW26 Profile
Site SW26 profile photo.
Subsoil

B2110-30 cmVery dark grey (7.5YR3/0); light clay; strong medium polyhedral, parting to strong fine blocky structure; firm consistence moist; pH 7.7; gradual change to:

B2230-60 cmVery dark grey (10YR3/1); medium clay; strong medium blocky, parting to strong fine blocky structure; very firm consistence moist; pH 8.5; gradual change to:

B2360-100 cmVery dark grey (10YR3/1); medium clay; strong medium blocky, parting to strong fine blocky structure; very firm consistence moist; contains a few (5-10 %) calcareous nodules and soft segregations; pH 8.8; gradual change to:

B24100-130 cmVery dark grey (10YR3/1); medium clay; contains a common (20%) amount of calcareous nodules and soft segregations; pH 8.7; abrupt change to:

C130+ cmVolcanic ash deposits.

Key Profile Features:
  • Clay texture throughout profile.

Key Profile Characteristics:


pH

Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Moderate
Non-Sodic
None1
Subsoil
(B21 horizon)
Slightly Alkaline
Moderate
Non-Sodic
Strong2
Deeper subsoil
(at 1 m)
Strongly Alkaline
Moderate
Sodic
Moderate3
1. Slight dispersion after remoulding.
2. Complete dispersion after remoulding.
3. Strong dispersion after remoulding.

Image:  SW26 pH
Image:  SW26 Salinity
The surface horizon is slightly acid. The upper subsoil is slightly alkaline becoming strongly alkaline at 80 cm depth.
The surface has a moderate salinity rating. The subsoil is high at 45 cm then decreases with depth.
Image:  SW26 Sodicity
Image:  SW26 Clay
The surface is non-sodic. The subsoil becomes sodic at 25-30 cm depth.
The clay content increases gradually down the profile.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
6.7
0.4
0.4
19
11
1.7
1
B21
10-30
7.7
0.38
0.38
0.04
19
18
4.8
2.8
B22
30-60
8.5
0.79
0.79
0.09
16
21
6.8
4.7
B23
60-100
8.8
0.4
0.4
0.03
13
18
6.5
2.7
B24
100-130
8.7
0.37
0.37
0.02
13
16
5.4
2.3
C
130+

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)
A1
0-10
63
37
8
15
17
44
B21
10-30
64
40
3
14
32
39
B22
30-60
70
43
1
7
24
57
B23
60-100
61
38
1
5
22
54
B24
100-130
0
34
1
6
10
57
C
130+

Profile Described By: Mark Imhof and Austin Brown, August 1998.
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