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Site SW25

Location: CamperdownAustralian Soil Classification: Ferric (& Sodic), Eutrophic, Brown CHROMOSOL
General Landscape Description: Grazing paddock (dairy).Mapping Unit: Unit 2 (Maher and Martin, 1987).
Site Description: Gently undulating plain.Geology: Quaternary - Newer volcanics (scoria).

Image: SW25 Landscape
Site SW25 landscape


Soil Profile Morphology:

Surface Soil

A110-10 cm Very dark brown (10YR2/2); very fine sandy clay loam; weak coarse blocky, parting to moderate medium polyhedral structure; very firm consistence dry; pH 5.3; gradual change to:

Image: SW25 Profile
Site SW25 profile photo.
A1210-30 cmVery dark greyish brown (10YR3/2); very fine sandy clay loam; moderate medium polyhedral, parting to moderate to strong fine polyhedral structure; pH 5.3; firm consistence moist; clear change to:

A230-50 cmDark brown (10YR4/3); conspicuously bleached; gravelly clay loam; contains many (50%) ferruginous nodules (2-10 mm size); pH 6.2; abrupt change to:

Subsoil

B2150-60 cmDark brown (7.5YR4/4); medium clay; moderate coarse polyhedral, parting to strong medium polyhedral structure; strong consistence dry; pH 6.7:

B2260-80 cmDark brown (10YR4/3); medium heavy clay; strong coarse prismatic, parting to medium prismatic and moderate coarse blocky structure; strong consistence dry; pH 7.0:

B2380+ cmDark brown (7.5YR4/2) with yellowish brown (10YR5/8) mottles; medium clay; strong coarse prismatic, parting to medium prismatic and moderate coarse to medium blocky structure; pH 7.2.

Key Profile Features:
  • Many ferruginous nodules in subsurface (A2).
  • Strong texture contrast between surface (A) horizons & subsoil (B21) horizon.

Key Profile Characteristics:


pH


Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Non-Sodic
Deeper subsoil
(at 80+ cm)
Slightly Alkaline
Very Low
Sodic
Image: SW25 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A11
0-10
5.3
4.7
0.31
0.02
7.9
1.6
1.2
0.1
A12
10-30
5.3
4.6
0.11
6.7
2
0.4
0.1
A2
30-50
6.2
5.3
0.07
5.1
2.6
0.3
0.2
B21
50-60
6.7
5.8
0.11
6.2
8.4
0.2
0.8
B22
60-80
7
6.1
0.14
5.9
11
0.3
2
B23
80+
7.2
6.2
0.16
6.6
15
0.3
3.2

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
0-10
39
16
9
34
21
22
A12
10-30
34
12
9
37
23
23
A2
30-50
28
11
23
34
17
22
B21
50-60
44
28
6
16
8
64
B22
60-80
51
32
3
12
11
71
B23
80+
53
31
5
20
16
56

Profile described by: Mark Imhof and Austin Brown, August 1998.
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