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MM5149

Site code
      MM5149
Location
      Lal Lal Reservoir (Elaine Road), Gordon district, central Victorian Highlands
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
0–25
Very dark greyish brown (10YR3/2); clay loam; weak coarse granular structure; firm consistence (dry); clear boundary to:

A2
25–45
Sporadically bleached, light grey (10YR7/2 dry); clay loam; common fine segregations; sharp boundary to:

B21
45–65
Very dark greyish brown (10YR3/2); heavy clay; strong coarse blocky structure; strong consistence (dry); gradual boundary to:

B22
65+
Dark greyish brown (2.5Y4/2) with brown (10YR5/8) mottles; heavy clay; strong coarse blocky structure; strong consistence (dry).

ASC: Melacic-Mottled, Eutrophic , Black Chromosol

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

Site MM5149
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
5.3
N/R
0.07
N/R
1.8
1.8
0.2
0.1
38
11.5
A2
25–45
5.8
N/R
0.03
N/R
1.3
1.3
0.1
0.2
15
11.2
B21
45–65
6.4
N/R
0.05
N/R
5.7
5.7
0.2
1.3
N/R
17.7
B22
65+
6.7
N/R
0.07
N/R
8
8
0.3
1.6
N/R
7.8

Site MM5149
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–25
43.8
19.7
6
32
26
28
4.4
1.05
A2
25–45
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
45–65
50.2
31.1
5
13
10
68
N/R
1.12
B22
65+
N/R
N/R
5
12
13
68
N/R
N/R

Management considerations
Strong texture contrast between the surface soil and the subsoil is a very important soil feature and may impact upon subsoil permeability. Sporadically bleached A2 horizons containing many fine segregations are key features of this profile while 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 a recommended management practice.
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