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SWSL361

Site code
      SWSL361
Location
      Irrewillipe East (McNabbs Road), Colac district, south-west Victoria
Landform
      Undulating rises
Geology
      Neogene Hanson Plain Sand: fluvial gravel, sand, silt
Element
      Lower slopes

Soil Profile Morphology:
Horizon

Depth (cm)

Description

A1
0–20
Black (10YR2/1); fine sandy loam; apedal massive structure; weak consistence (dry); clear boundary to:

A2
20–50
Pale brown (10YR6/3), conspicuously bleached, very pale brown (10YR8/2 dry); fine sandy loam; very many fine segregations; sharp boundary to:

B21
50–65
Brown (7.5YR4/4) with red (2.5YR4/6) mottles; medium clay; moderate medium blocky structure; boundary to:

B22
65+
Brown (7.5YR4/4) with red (2.5YR4/6) mottles; medium clay; moderate medium blocky structure.

ASC: Melacic, Eutrophic, 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
A1
0–20
5.2
N/R
0.06
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A2
20–50
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
50–65
6.1
N/R
0.03
N/R
3.7
6.7
0.14
0.29
N/R
10
B22
65+
6.2
N/R
0.04
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
A1
0–20
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A2
20–50
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
50–65
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B22
65+
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Management Considerations:

This site has a sandy, hardsetting topsoil with a strong texture contrast between the surface soil and the subsoil. A bleached A2 horizon is an indication of restricted drainage, poor soil structure (often massive) and low organic matter and 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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