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WIA20

WLRA - soil pit WIA20- landscape
Cultivation on texture contrast soils
    Site Code
 WIA20
WLRA - soil pit WIA20- profile
Hypocalcic, Subnatric, Grey Sodosol

    Location

Drung Drung, Horsham, western Victoria

    Landform

Terrace plain

    Geology

Quaternary Coonambidgal Formation: fluvial to lacustrine clays and sands

    Element

Terrace flat
Horizon
Depth (cm)
Description

A1

0–5

Greyish brown (10YR5/2) sandy clay loam; plastic; hard setting surface condition; weak coarse blocky structure; strong consistence dry; slightly sticky consistence wet; pH 6.6; sharp and smooth boundary to:

B21

5–30

Grey (10YR5/1) light clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; moderately sticky consistence wet; pH 7.5; gradual boundary to:

B22

30–60

Grey (5Y5/1) light clay; subplastic; weak coarse blocky structure; strong consistence dry; moderately sticky consistence wet; very few (<2%) calcareous nodule segregations; pH 8.9; gradual and smooth boundary to:

B23

60–85

Grey (5Y5/1) light clay; subplastic; weak coarse blocky structure; strong consistence dry; moderately sticky consistence wet; very few (<2%) calcareous nodule concretions; pH 8.0.

B24

85–100

Grey (5Y5/1) medium clay; subplastic; weak coarse blocky structure; strong consistence dry; moderately sticky consistence wet; very few (<2%) calcareous nodule concretions; pH 7.7.
Management considerations
  • Texture contrast soil, possible cracking clay (vertosol)
  • Slightly acid to neutral thin surface soil over neutral to alkaline subsoil
  • Hard setting, coarsely structured surface soil, not ideal for plant establishment
  • Subsoil has vertic properties, including subplasticity (feels lighter than lab data suggests), limited obvious structure
  • Subsoil is slightly sodic (subnatric), more sodic at depth and high magnesium
  • Yellow hue (5Y) would suggest reducing conditions , poor internal drainage as clay in subsoil expands
  • Landscape element, terrace flat; slow site drainage unless near drainage line
Site
WIA20
Sample depth cm
pH
EC
dS/m
NaCl
%
Ex Ca
cmol-/kg
Ex Mg
cmol-/kg
Ex K
cmol-/kg
Ex Na
cmol-/kg
Ex Al
mg/kg
Ex acidity
cmol-/kg
FC
-30okPa
PWP
-1500okPa
KS
%
FS
%
Z
%
C
%
Horizon
H2O
CaCl2
A1
0–5
6.6
NA
0.15
0.03
5
7.3
0.8
1
NA
6
23.5
12.6
6
46
15
33
B21
5–30
7.5
NA
0.19
0.03
9.1
13.8
0.9
2.9
NA
2.9
NA
19.1
4
27
13
54
B22
30–60
8.9
NA
0.46
0.06
9.8
15.1
1
4.1
NA
4.2
NA
19.8
3
24
16
55
B23
60–85
8.0
NA
0.9
0.1
9.8
15.1
1.1
4.6
NA
3
NA
19.8
4
24
17
55
B24
85–100
7.7
NA
2.16
0.12
11.6
16.2
1.1
5.4
NA
2.4
NA
21.7
2
20
17
58
Note: NA=not assessed
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