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MM5102

Site code
      MM5102
Location
      Wurdiboluc Reservoir (Mathison Road), Winchelsea district, south-west Victoria
Landform
      Gently undulating basalt rises
Geology
      Quaternary Newer Volcanics: extrusive tholeiitic to alkaline basalts, minor scoria and ash
Element
      Crest

Profile morphology
Horizon

Depth (cm)

Description

A1
0–20
Very dark greyish brown (10YR3/2); fine sandy clay loam; apedal massive structure; weak consistence (dry); boundary to:

A2
20–45
Sporadically bleached, light grey (10YR7/2 dry); fine sandy clay loam; apedal massive structure; weak consistence (dry); boundary to:

B21
45+
Yellowish brown (10YR5/6) with red (2.5YR4/6) mottles; medium clay; strong coarse blocky structure; very firm consistence (moderately moist).

ASC: Melanic, Mottled-Subnatric, Brown Sodosol

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

Site MM5102
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
0.05
N/R
1.9
1.9
0.2
0.2
21
10.4
A2
20–45
6.2
N/R
0.03
N/R
0.9
0.9
0
0.2
0
3.4
B21
45+
6.8
N/R
0.09
N/R
3.3
3.3
0.3
2.6
N/R
9.6

Site MM5102
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–20
22.3
13.7
25
40
13
17
2.2
1.21
A2
20–45
N/R
N/R
27
45
4
21
0.6
N/R
B21
45+
37.5
26.6
11
16
4
67
0.6
1.27

Management considerations
This soil exhibits hardsetting topsoils with strong texture contrast between the surface soil and the subsoil that may impact upon subsoil permeability. Conspicuously bleached A2 horizons containing many fine segregations are key features of this profile. 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. Penetration by deep-rooted crops is also useful as is minimum tillage practices which avoids bringing the sodic material to the surface.
CC BY 4.0 AU

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