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OTR492

Location: Freshwater Creek

Australian Soil Classification: Eutrophic, Mottled-Subnatric, Brown SODOSOL
Northcote Factual Key: Dy5.31

General Landscape Description: Undulating Plain
Site Description: Crest Slope: 5% Aspect: South-West
Native Vegetation: Woodland; E. viminalis (Manna Gum)
Geology: Tpb: Neogene (Tertiary) fluvial sediments; gravel, sand, silt (Brighton Group)


Soil Profile Morphology:

Surface Soil

A10-30 cmBrown (10YR4/3); fine sandy loam;apedal to weak subangular blocky structure; a few ferruginous nodules; pH 4.4; abrupt change to:
Subsoil

B230-110 cmYellowish brown (10YR5/6), with many yellowish red (5YR5/6) mottles; medium clay; strong fine to very fine subangular blocky structure; many clay cutans; pH 4.7; diffuse irregular change to:
C110+ cmDark red (2.5YR3/6), with many grey (10YR5/1) and yellowish brown (10YR5/8) mottles; medium clay; moderate subangular blocky structure; very firm consistence, dry; pH 4.8.


Soil Profile Characteristics:

Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Medium
Non-Sodic
Subsoil
(B21 horizon)
Moderately Acid
Medium
Sodic
Deeper Subsoil
(at 110 cm)
Slightly Acid
Medium
Sodic

Graphs for site OTR492
The surface and upper subsoil is moderately acid. The deeper subsoil is slightly acid.The salinity rating in this profile is medium. The surface is non-sodic. The subsoil is sodic.
The clay content is low in the surface. There is a sharp increase in clay content at the A/B interface.
Horizon
Horizon Depth
(cm)
pH
(water)
EC
dS/m
Cl
%
Organic Carbon
%
Total N
%
P
ppm
K
ppm
Free Fe
%
Exchangeable Cations
Total Bases
cmolc/kg
Ex Ac
cmolc/kg
CEC
cmolc/kg
Ca
Mg
K
Na
cmolc/kg
A1
0-10
5.7
0.15
0.015
1.4
0.093
7
140
2.8
2.7
2.7
0.3
0.2
5.9
1.5
7.4
10-20
5.4
0.18
0.019
1.3
0.083
5
140
2.9
2.8
2.8
0.3
0.4
6.3
2.7
9.0
20-30
5.5
0.16
0.017
1.1
0.068
3
120
2.3
2.4
2.3
0.2
0.4
5.3
2.2
7.5
B2
50 - 60
5.8
0.36
0.047
0.7
0.072
3
280
5.7
4.7
8.5
0.7
1.3
15.2
3.3
18.5
C
110 - 120
6.2
0.34
0.045
2
90
6.2
3.2
8.1
0.2
2.0
13.5
0.6
14.1
Horizon
Horizon Depth
(cm)
Gravel
%
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
13
17
59
5
16
10-20
13
17
57
7
17
20-30
11
18
59
8
12
B2
50 - 80
8
4
13
4
75
C
110 - 120
24
2
26
3
66


Profile Described By: Andrew Thornley, 12th August 1969.
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