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OTR736

OTR736 landscape
Remnant forest of the Otway Ranges
    Site Code
OTR736

OTR736 profile
Melacic, Dystrophic, Brown Dermosol
    Location
Mount Cowley
    Landform
Hill
    Geology
Cretaceous Otway Group
    Element
Upper slope
    Slope
33%
    Aspect
South westerly
Horizon
Depth (cm)
Description
A1
0–25Very dark greyish brown (10YR3/2); clay loam; moderate subangular blocky structure; diffuse smooth boundary to:

B21
25–30Dark yellowish brown (10YR3/4); medium clay; friable strong medium (11 mm) subangular blocky structure; gradual boundary to:

B22
30–110Brown (7.5YR4/4); light clay; friable moderate angular blocky structure (1 mm); angular weathering sandstone fragments common; clear irregular boundary to:

C
110+Yellowish brown (10YR5/6); light clay; weak subangular blocky structure; weathering sandstone fragments common.

Management considerations
The gradational soil profile has few physical limitations for agricultural production. This allows water and gas (air) to move without physical limitations, but remains dependent on any chemical or depth restrictions. Friable surface soils (and subsoils) occur where there is a build up of organic matter, (and to some extent iron rich clay complexes) generally in cooler wetter areas (less extreme wetting and drying cycling). The acidic subsoil most likely reflects the acidic nature of the parent material or where there has been sufficient leaching of the soil (possibly due to the high rainfall of the Otways). These subsoils affect nutrient availability, creating a nutrient imbalance and the potential for aluminium and manganese toxicity. Deficiencies of calcium, potassium and molybdenum are likely. Charcoal was also observed in the profile at 15cm, possibly an indicator of historic fires.

Analytical data
Site OTR736
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
FC
(-10kPa)
PWP
(-150kPa)
KS
FS
Z
C
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
%
%
%
%
%
%
A1
0-10
5.5
N/R
0.084
0.008
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A1
10-20
5.3
N/R
0.045
0.005
0.2
0.2
0.5
0.05
N/R
N/R
N/R
N/R
4
41
27
23
A1
20-25
5.2
N/R
0.039
0.003
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
25-30
5.1
N/R
0.038
0.004
0.03
0.06
0.4
0.03
N/R
N/R
N/R
N/R
2
29
23
38
B22
60-90
4.8
N/R
0.039
0.005
<0.01
<0.01
0.4
<0.01
N/R
N/R
N/R
N/R
5
26
19
44
C
120-150
4.9
N/R
0.032
0.004
<0.01
<0.01
0.2
<0.01
N/R
N/R
N/R
N/R
21
42
18
16
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