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MM54

Site code
      MM54
Location
      Warncoort (Bourkes Road), Colac district, south-west Victoria
Landform
      Plains
Geology
      Quaternary alluvium: lagoon and swamp deposits; silt, clay
Element
      Streambank

Profile morphology
Horizon

Depth (cm)

Description

A1
0–30
Very dark greyish brown (10YR3/2); fine sandy loam; apedal massive structure; very weak consistence (dry); clear boundary to:

A2
30–55
Brown (10YR5/3), conspicuously bleached, light grey (10YR7/2 dry); sandy loam; apedal massive structure; very weak consistence (dry); sharp boundary to:

B21
55–80
Very dark grey (10YR3/1) with grey (10YR4/6) mottles; heavy clay; strong coarse blocky structure; very firm consistence (moderately moist); gradual boundary to:

B22
80+
Greyish brown (10YR5/2) with brown (10YR5/8) mottles; heavy clay; strong coarse blocky structure; very firm consistence (moderately moist).

ASC: Melacic, Mottled-Subnatric, Black Sodosol

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

Site MM54
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
0–30
5.3
N/R
0.04
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A2
30–55
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
55–80
6.7
N/R
0.12
N/R
4.0
8.4
0.32
2.8
N/R
10
B22
80+
7.8
N/R
0.15
0.02
N/R
N/R
N/R
N/R
N/R
N/R

Site MM54
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–30
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
A2
30–55
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
55–80
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B22
80+
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Management considerations
Strong texture contrast between the surface soil and the subsoil is a very important soil feature and may have an impact upon the permeability. Acidic surface soils and conspicuously bleached A2 horizons are other key topsoil features. Mottled subsoils are common and are an indication of periodic waterlogging. Improved drainage and the application of gypsum to improve structure and permeability may reduce the incidence of waterlogging while increasing organic matter and maintaining vegetative cover is also important.
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