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MM97

Site code
      MM97
Location
      Birregurra (Matthews Creek and Deepdene Road), Colac district, south-west Victoria
Landform
      Undulating low hills
Geology
      Neogene Gellibrand Marl: marine silty clay, clayey silt, calcareous, minor calcarenite
Element
      Upper hill slope

Profile morphology
Horizon

Depth (cm)

Description

A1
0–20Dark brown (10YR3/3); fine sandy loam; apedal massive structure; weak consistence (dry); clear boundary to:

A2
20–60Brown (10YR5/3), conspicuously bleached, very pale brown (10YR7/3 dry); fine sandy loam; common fine segregations; sharp boundary to:

B21
60+Yellowish brown (10YR5/6) with red (2.5YR4/6) mottles; medium clay; strong coarse blocky structure; very firm consistence (dry).

ASC: Eutrophic, Mottled-Subnatric, Brown Sodosol

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

Site MM97
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
5.6
N/R
0.09
N/R
1.4
1.4
0.5
0.3
N/R
14.8
A2
20–60
6.1
N/R
0.03
N/R
0.6
0.6
0.1
0.1
N/R
2.9
B21
60+
6.9
N/R
0.17
N/R
1.9
1.9
0.2
2.2
N/R
6.2

Site MM97
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–20
26.9
12.7
16
54
12
11
4.7
1.15
A2
20–60
N/R
N/R
23
58
12
7
0.6
N/R
B21
60+
37.4
27.9
3
28
6
62
N/R
1.46

Management considerations
Strong texture contrast between the sandy topsoil and the medium clay subsoil is a very important soil feature and may impact upon subsoil permeability. The conspicuously bleached A2 horizon is a key feature of this profile while sodic and 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 and hold the sandy topsoil in place. Penetration by deep-rooted crops is also a recommended management practice.
CC BY 4.0 AU

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