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SW44

Location: South Ecklin.

Australian Soil Classification: Bleached-Vertic, Eutrophic, Yellow CHROMOSOL.
General Landscape Description: Gently undulating plain
Site Description: Grazing paddock (dairy).
Mapping Unit: Unit 155 (Maher and Martin, 1987).
Geology: Tertiary - Moorabool Viaduct Formation.



Image:  SW44 Landscape
SW44 Landscape



Soil Profile Morphology:

Surface Soil

O0-12 cmRoot mat:

Image:  SW44 Profile
SW44 profile
A112-20 cmDark brown (7.5YR3/2); fine sandy loam; pH 5.7:

A220-35 cmLight yellowish brown (10YR6/4) conspicuously bleached, with a few (10%) strong brown (7.5YR5/8) and yellowish brown (10YR5/8) mottles; fine sandy clay loam; contains a few (5%) ferruginous nodules (5-15 mm in size); pH 5.9:

Subsoil

B2135-50 cmLight yellowish brown (10YR6/4) with a common (20%) amount of strong brown (7.5YR5/6) mottles; light medium clay; strong coarse blocky, parting to strong medium polyhedral structure; firm consistence moist; contains a few (10%) ferruginous nodules (2-40 mm in size); pH 6.0:

B2250-80 cmLight yellowish brown (10YR6/4) with a common amount of yellow (10YR7/8) mottles; medium clay; moderate coarse prismatic, parting to strong coarse blocky and medium polyhedral structure; contains very few (2-5%) ferruginous nodules (up to 50 mm in size); pH 6.1:

B380+ cmLight grey (10YR7/1) with many yellow (10YR7/8) mottles; medium clay; strong coarse lenticular, parting to strong fine lenticular structure; slickensides present; pH 7.0.

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



Soil Profile Characteristics:
-

pH
Salinity
Surface Soil
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None
Subsoil
(35-50 cm)
Moderately Acid
Low
Non-Sodic
None
Deeper Subsoil
(80+ cm)
Neutral
Low
Sodic
Slight


Image:  SW44 pH
Image:  SW44 Salinity
Image:  SW44 Clay
The surface and upper subsoil is moderately acid.
The subsoil becomes neutral at 80 cm depth.
The salinity rating is very low throughout the profile.
The clay content increases markedly at 35 cm depth.



Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
Organic Carbon
%
Total
Nitrogen
%
Exchangeable Cations
Coarse Sand
(0.2-2.0 mm)
%
Fine Sand
(0.02-0.2 mm)
%
Silt
(0.002-0.02 mm)
%
Clay
(<0.002 mm)
%
Field Capacity
% w/w
Wilting Point
% w/w
Ca
Mg
K
Na
meq/100g
A1
12-20
5.7
4.8
0.06
3.4
0.21
3.9
0.3
0.1
0.05
14
53
17
8
25.9
7.8
A2
20-35
5.9
5.0
<0.05
1.4
0.8
0.05
0.05
12
56
17
15
18.9
5.6
B21
35-50
6.0
5.3
0.1
4.3
4.4
0.1
0.4
8
33
10
48
29.8
18.6
B22
50-80
6.1
5.6
0.12
5.1
4.3
<0.1
0.5
6
25
9
60
36.9
22.9
B3
80+
7.0
6.3
0.14
7.5
4
0.1
1.3
8
24
9
59
37.3
22.4



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