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CLRA11

CLRA11 landscape

Low hills near Kennedys Creek, Otway Ranges
    Site Code
CLRA11


CLRA11 profile
Melanic, Eutrophic, Black Kurosol
    Location
Kennedys Creek (Lavers Hill Cobden Road), Otway Ranges, south-west Victoria
    Landform
Low hills
    Geology
Neogene Gellibrand Marl: marine silty clay, clayey silt, calcareous, minor calcarenite
    Element
Mid slope
    Slope
165%
    Aspect
North-north-east
Horizon
Depth (cm)
Description
A1
0–20Very dark grey (10YR3/1); sandy clay loam; strong coarse and medium blocky, parting to fine and very fine polyhedral structure; rough ped fabric; strong consistence (dry); non-calcareous, pH 6.0; clear smooth boundary to:

B21g
20–50Very dark greyish brown (2.5Y3/2) with common medium distinct brownish yellow (10YR6/8) mottles; light medium clay; strong fine to medium polyhedral structure; smooth ped fabric; strong consistence (dry); non-calcareous, pH 5.5; gradual smooth boundary to:

B22g
50–85Greyish brown (2.5Y5/2) with many coarse prominent yellowish brown (10YR5/6) mottles; medium heavy clay; strong fine to medium polyhedral structure; smooth ped fabric; strong consistence (dry); non-calcareous, pH 5.5; gradual irregular boundary to:

B23g
85–130+Greyish brown (2.5Y5/2) with many coarse prominent yellowish brown (10YR5/6) mottles; medium clay; strong very fine lenticular structure; smooth ped fabric; strong consistence (dry); non-calcareous, pH 5.5.

Management considerations
This soil is similar to that described by CLRA10, it is gradational with limited texture change with depth and gradational horizon boundaries. The weak structure contributes to the imperfect drainage of the soils as evidenced by subsoil mottling and colour. Other influences on drainage include rainfall and topographic position; here on a mid slope receiving moisture from upslope. Texture and soil stability indicies were not recorded but regarded as similar to CLRA10 where fine sand is a dominant component of this soil and the soil is quite stable (Emerson class 5 for subsoil) though a little less so for the B1horizon (Emerson class 3(1) for subsoil). The high organic matter content of the surface (9.9% OM) and the upper subsoil (1.9% OM) aids stability. The surface soil is slightly limited in depth and therefore restricting as a seedbed. The lower pH in the subsoil will restrict the availability of some nutrients (less calcium) and increase the availability and mobility of aluminium, while the higher surface pH is a result of management intervention to improve nutrient availability.
Analytical data
Site CLRA11
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex Acidity
FC
–10kPa
PWP
–1500kPa
KS
FS
Z
C
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
%
%
%
%
%
%
A1
0–20
5.8
5.1
0.14
N/R
9.7
3.3
0.41
0.53
N/R
15
N/R
N/R
N/R
N/R
N/R
N/R
B21g
20–50
5.3
4.5
0.08
N/R
4.4
4.8
0.47
0.44
N/R
12
N/R
N/R
N/R
N/R
N/R
N/R
B22g
50–85
4.9
4.1
0.14
N/R
3.7
6.1
0.5
0.73
N/R
16
N/R
N/R
N/R
N/R
N/R
N/R
B23g
85–130+
5.2
4.1
0.11
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
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