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SWSL358

Site code
      SWSL358
Location
      Tomahawk Creek (Irrewillipe Road), Colac district, south-west Victoria
Landform
      Gently undulating rises
Geology
      Neogene Hanson Plain Sand: fluvial gravel, sand, silt
Element
      Mid slope

Soil Profile Morphology:

Horizon

Depth (cm)

Description

A11
0–10
Very dark greyish brown (10YR3/2); fine sandy clay loam; apedal massive structure; weak consistence (dry); clear boundary to:
A12
10–40
Yellowish brown (10YR5/6), brownish yellow (10YR6/6 dry); fine sandy clay loam; fragipan or earthy pan; sharp boundary to:
B21
40–55
Yellowish brown (10YR5/6); medium clay; apedal massive structure; clear boundary to:
B22
55+
Yellowish brown (10YR5/6) with red (2.5YR4/6) mottles; medium clay; moderate medium blocky structure.

ASC: Mottled, Mesotrophic, Brown Chromosol

Analytical data Source: Government of Victoria, State Chemistry Laboratory.

Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
A11
0–10
5.6
N/R
0.04
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A12
10–40
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
40–55
6
N/R
0.03
N/R
0.69
2.7
0.09
0.31
N/R
7.2
B22
55+
5.9
N/R
0.07
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A11
0–10
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A12
10–40
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
40–55
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B22
55+
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Management Considerations:

The surface soil is hardsetting with a strong texture contrast between the surface soil and the subsoil which may impact upon subsoil permeability. Mottled subsoils are other prominent features of this soil type.

The application of gypsum would be suitable for soil structure and improved permeability, while increasing organic matter and maintaining vegetative cover is important to help improve the soil structure. Penetration by deep-rooted crops is also useful.
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