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MM5028

Site code
      MM5028
Location
      Lara (Patullos Road), Lara district, south-west Victoria
Landform
      Undulating rises
Geology
      Quaternary Newer Volcanics: extrusive tholeiitic to alkaline basalts, minor scoria and ash
Element
      Flat

Profile morphology
Horizon

Depth (cm)

Description

A1
0–5
Dark brown (7.5YR3/2); clay loam; strong coarse blocky structure; firm consistence (dry); sharp boundary to:
B21
5–40
Dark brown (7.5YR3/2); heavy clay; strong coarse blocky structure; strong consistence (dry); boundary to:
B22
40–60
Brown (10YR5/3); heavy clay; moderate fine blocky structure; very firm consistence (moderately moist); boundary to:
B23
60+
Greyish brown (2.5Y5/2); medium clay; moderate fine blocky structure; firm consistence (moderately moist); common calcareous soft segregations.

ASC: Vertic (& Calcic), Hypernatric, Black Sodosol

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

Site MM5028
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
0–5
6.9
N/R
0.28
0.05
7
7
1.3
3.9
0
11
B21
5–40
8.2
N/R
1.01
0.23
10.2
10.2
1.3
14.8
0
0
B22
40–60
8.8
N/R
1.37
0.29
7.8
7.8
1.4
16.2
N/R
0
B23
60+
9.2
N/R
1.51
0.32
7.1
7.1
1.4
16.2
N/R
0

Site MM5028
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–5
41.1
27.2
9
24
12
44
3
1.53
B21
5–40
63.9
46.2
4
11
13
68
N/R
1.06
B22
40–60
N/R
N/R
5
15
15
64
N/R
N/R
B23
60+
N/R
N/R
5
14
16
57
N/R
N/R

Management considerations
This soil exhibits shallow topsoils leading to strong, blocky, cracking clay subsoils. The subsoils are alkaline and highly sodic with calcareous segregations present at depth. These subsoils usually have poor structure and results in dispersion (and subsequent clogging of pores), restricting water and gas movement through the subsoil.

Improvement of soil structure through increased organic matter would be useful, and addition of gypsum where sodic would be beneficial. Bringing this material to the surface is likely to contribute to surface sealing and increase erosion susceptibility.
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