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SWSL363

Site code
      SWSL363
Location
      Larpent (Middletons Road), Colac district, south-west Victoria
Landform
      Gently undulating plains
Geology
      Neogene Hanson Plain Sand: fluvial gravel, sand, silt
Element
      Upper slope

Soil Profile Morphology:

Horizon

Depth (cm)

Description

A1
0–20
Very dark greyish brown (10YR3/2); clay loam; apedal massive structure; very firm consistence (dry); clear boundary to:
A2
20–50
Greyish brown (10YR5/2), conspicuously bleached, light grey (10YR7/1 dry); clay loam; sharp boundary to:
B21
50–75
Very dark brown (10YR2/2) with brown (10YR4/6) mottles; medium heavy clay; strong medium blocky structure; gradual boundary to:
B22
75+
Dark brown (10YR3/3) with brown (7.5YR4/6) mottles; medium clay; moderate medium blocky structure.

ASC: Melanic, Eutrophic, Black 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
5.5
N/R
0.08
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
50–75
6.4
N/R
0.05
N/R
5.3
12
0.23
1.3
N/R
14
B22
75+
6.5
N/R
0.12
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
50–75
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B22
75+
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Management Considerations:

This site has a 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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