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SW41

Location: Elingamite

Australian Soil Classification: Bleached-Vertic (& Ferric), Eutrophic, Brown CHROMOSOL
General Landscape Description: Level plain (between basalt barriers).
Site Description: Grazing paddock (dairy).
Mapping Unit: Unit 2 (Maher and Martin, 1987).
Geology: Quaternary - Newer volcanics (basalt).


Image:  SW41 Landscape
Site SW41 Landscape



Soil Profile Morphology:

Surface Soil

A10-10 cmVery dark greyish brown (10YR3/2); very fine sandy clay loam; moderate medium blocky structure; weak consistence moist; pH 5.7; clear change to:

    Image:  SW41 Profile
    Site SW41 profile
A2110-20 cmYellowish brown (10YR5/8); fine sandy clay loam; firm consistence, dry; contains a few (5%) basalt fragments; pH 5.5; clear change to:

A2220-40 cmBrown (10YR5/3), conspicuously bleached; fine sandy clay loam; firm consistence, dry; contains very many (70%) ferruginous nodules (2-10 mm in size); pH 6.0; sharp and wavy change to:

Subsoil

B2140-60 cmYellowish brown (10YR5/4) with a few bright yellowish brown (10YR5/8) mottles; medium clay; strong medium blocky, parting to strong fine polyhedral structure; weak consistence moist; contains very few (5%) ferruginous nodules (2-10 mm in size); pH 6.0; clear change to:

B2260-80 cmGreyish brown (10YR5/2) with many yellowish brown (10YR5/8) mottles; medium heavy clay; strong lenticular structure; slickensides present; firm consistence moist; pH 5.9; clear change to:

B2380-100 cmGrey (10YR5/1) with common yellowish brown (10YR5/8) mottles; light medium clay; strong lenticular structure; strong consistence, dry; large slickensides present; contains a common (10%) amount of basalt fragments; pH 6.0:

C100+ cmWeathered basalt.


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


Soil Profile Characteristics:
-

pH
Salinity
Surface Soil
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None
Subsoil
(40-60 cm)
Moderately Acid
Very Low
Sodic
None
Deeper Subsoil
(80-100 cm)
Moderately Acid
Low
Sodic
None


Image:  SW41 pH
Image:  SW41 Salinity
Image:  SW41 Clay
The whole profile is moderately acid throughout.
The profile has a very low to low salinity rating.
The clay content increases sharply at 40 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
0-10
5.7
5.0
0.08
4.8
0.26
6.9
0.9
0.2
0.05
6
32
28
19
43
17
A21
10-20
5.5
4.7
0.06
3
1
0.2
0.05
5
37
29
21
34
12
A22
20-40
6.0
5.2
0.06
1.3
1.5
0.1
0.05
21
32
24
20
27
10
B21
40-60
6.0
5.2
0.1
2.8
6.5
0.2
0.8
4
12
9
61
50
31
B22
60-80
5.9
5.3
0.17
3.6
8.5
<0.1
1.7
2
8
9
69
56
37
B23
80-100
6.0
5.3
0.2
4.8
9.9
<0.1
2.1
11
28
12
43
50
28



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