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MM187

Site code

      MM187
Location
      Werneth (Colac Ballarat Road), Rokewood district, south-west Victoria
Landform
      Gently undulating lava plains
Geology
      Quaternary Newer Volcanics: extrusive tholeiitic to alkaline basalts, minor scoria and ash
Element
      Side slopes

Profile morphology
Horizon

Depth (cm)

Description

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

A2
10–15
Yellowish brown (10YR5/4), light grey (10YR7/2 dry) conspicuously bleached; fine sandy clay loam; firm consistence (dry); sharp boundary to:

B21
15–40
Very dark greyish brown (10YR3/2 moist) with red (5YR4/4) mottles; heavy clay; strong coarse blocky structure; strong consistence (dry); gradual boundary to:

B22
40–50
Yellowish brown (10YR5/4); medium clay; strong medium blocky structure; very firm consistence (moderately moist); clear boundary to:

B23
50+
Light yellowish brown (2.5Y6/4); medium clay; moderate fine blocky structure; firm consistence (moderately moist).


ASC: Eutrophic, Mottled-Hypernatric, Black Sodosol

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

Site MM187
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
0–10
5.9
N/R
0.13
N/R
1.9
1.9
1.2
0.3
7
3.9
A2
10–15
6.3
N/R
0.16
0.03
2
2
0.6
1.1
0
7.3
B21
15–40
8.3
N/R
0.6
0.06
6.3
6.3
1.5
7.3
N/R
0
B22
40–50
8.5
N/R
0.61
0.1
5.6
5.6
1.5
9.4
N/R
0
B23
50+
9.3
N/R
1.01
0.18
16.2
16.2
0.9
9.6
N/R
0

Site MM187
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–10
18.9
12.7
18
46
18
14
4
1.23
A2
10–15
N/R
N/R
19
42
18
19
1.6
N/R
B21
15–40
54.2
36.7
7
19
13
57
N/R
1.15
B22
40–50
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B23
50+
N/R
N/R
4
13
9
41
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. The fine ferruginous segregations can restrict root penetration and limit available water holding capacity where there are sufficient amounts, often forming a discontinuous or continuous pan where concentrated (>50%). Sodic and mottled subsoils are other key features of this soil and are an indication of periodic waterlogging.

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.
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