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MM113

Site code
      MM113
Location
      Ondit (Colac Ballarat Road), Colac district, south-west Victoria
Landform
      Gently undulating plains
Geology
      Quaternary Newer Volcanics: extrusive valley filling basalts
Element
      Crest

Profile morphology
Horizon

Depth (cm)

Description

A1
0–25
Very dark greyish brown (10YR3/2); clay loam; apedal massive structure; weak consistence (dry); clear boundary to:

A2
25–35
Sporadically bleached; clay loam; sharp boundary to:

B21
35–70
Very dark greyish brown (10YR3/2) with grey (10YR4/6) mottles; heavy clay; strong coarse blocky structure; strong consistence (dry); gradual boundary to:

B22
70–100
Very dark greyish brown (10YR3/2); heavy clay; strong coarse blocky structure; strong consistence (dry).


ASC: Eutrophic, Mottled-Subnatric, Black Sodosol

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

Site MM113
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
0–25
6.2
N/R
0.07
N/R
3.1
3.1
0.3
0.8
N/R
14.3
A2
25–35
6.4
N/R
0.07
N/R
2.2
2.2
0.5
1.4
N/R
14.9
B21
35–70
7.4
N/R
0.12
N/R
2.8
2.8
1.1
3.9
N/R
11.6
B22
70–100
8.9
N/R
0.4
0.09
4.9
4.9
1.8
10.3
N/R
0

Site MM113
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–25
37.4
21.5
6
44
16
31
2.5
1.08
A2
25–35
N/R
N/R
6
41
14
36
1.7
N/R
B21
35–70
50.3
35.8
4
26
12
58
N/R
1
B22
70–100
N/R
N/R
3
19
9
66
N/R
N/R

Management considerations
These soils have hardsetting topsoils and exhibit a strong texture contrast between the surface soil and the subsoil with a bleached A2 horizon. The bleached A2 horizon is an indication of restricted drainage, poor soil structure (often massive) and low organic matter and nutrients.

Improvement of soil structure through increased organic matter would be useful while management options include reduced tillage, improving organic matter content and altering the subsoil through artificial drainage (ripping, mole drainage) and/or chemical amelioration (gypsum) to improve structure.
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