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MM227

Site code

      MM227
Location
      Camperdown (Boundary Road), Camperdown district, south-west Victoria
Landform
      Undulating basalt hills
Geology
      Quaternary Newer Volcanics: tuff rings, pyroclastic base surge and fall deposits consisting of ash, lapilli, scoria; well bedded and sorted, moderately consolidated
Element
      Mid slope

Profile morphology
Horizon

Depth (cm)

Description

A1
0–30
Black (10YR2/1); clay loam; moderate fine blocky structure; weak consistence (dry); clear boundary to:

A2
30–45
Sporadically bleached, light grey (10YR7/2 dry); clay loam; very many fine segregations; sharp boundary to:

B21
45–65
Very dark greyish brown (10YR3/2); medium clay; strong medium blocky structure; very firm consistence (moist); very many fine segregations; gradual boundary to:

B22
65–100
Brown (10YR4/3) with brown (10YR5/8) mottles; medium clay; strong medium blocky structure; firm consistence (moist); boundary to:

B23
100+
Dark greyish brown (10YR4/2) with brown (10YR5/8) mottles; medium clay; apedal massive structure; firm consistence (moist).

ASC: Bleached-Ferric; Eutrophic; Black Chromosol

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

Site MM227
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
6.3
N/R
0.1
N/R
5.6
5.6
0.3
0.6
N/R
13.2
A2
30–45
6.3
N/R
0.06
N/R
2.5
2.5
0.2
0.5
N/R
12.2
B21
45–65
7.1
N/R
0.21
0.02
5.7
5.7
0.3
1.4
N/R
11.1
B22
65–100
7.2
N/R
0.15
N/R
N/R
N/R
N/R
N/R
N/R
11.2
B23
100+
7.1
N/R
0.16
0.04
8
8
0.2
3.3
N/R
12.6

Site MM227
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–30
35.3
23.7
4
43
22
23
4.4
1.04
A2
30–45
22.2
15.5
21
37
20
18
N/R
N/R
B21
45–65
39.3
33.1
17
19
9
55
N/R
1.39
B22
65–100
N/R
N/R
3
16
10
70
N/R
N/R
B23
100+
N/R
N/R
4
12
10
73
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. Conspicuously bleached A2 horizons containing many fine segregations are key features of this profile. Sodic and 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 useful as is minimum tillage practices which avoids bringing the sodic material to the surface.
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