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WIA5

WLRA - soil pit WIA5- landscape
Cropped plains near Coromby
    Site Code
 WIA5
WLRA - soil pit WIA5- profile
Endocalcareous-Endohypersodic, Self-mulching, Red Vertosol

    Location

Coromby, western Victoria

    Landform

Plain

    Geology

Pliocene Parilla Sand: marine sand and silt

    Element

Plain

    Slope

0-1%
Horizon
Depth (cm)
Description

A1

0–10

Brown (10YR4/3); light clay; subplastic; cracking and self-mulching surface condition; weak coarse granular structure; weak consistence dry; pH 8.8; sharp and smooth boundary to:

B21

10–30

Reddish brown (5YR4/4); medium clay; plastic; strong very coarse prismatic structure; very strong consistence dry; sticky consistence wet; pH 9.1; clear and smooth boundary to:

B22k

30–65

Yellowish red (5YR4/5) with fine faint (7.5YR6/6) mottles; light clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; sticky consistence wet; few (2-10%) soft carbonate segregations; pH 9.3.

B23k

65–100

Yellowish red (5YR4/5) with faint (7.5YR6/6) mottles; heavy clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; sticky consistence wet; few (2-10 %) soft carbonate segregations; pH 9.1.

B24k

100–145

Yellowish red (5YR4/5) with fine faint (7.5YR6/6) mottles; heavy clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; sticky consistence wet; few (2-10%) soft carbonate segregations; pH 8.9; gradual boundary to:

B31

145–180

Brown (7.5YR5/5); medium clay; weak coarse subangular blocky structure; pH 8.9; gradual boundary to:

B32

180–215

Strong brown (7.5YR5/6) with (10YR6/3) mottles; medium clay; weak coarse subangular blocky structure; pH 8.9.
Management considerations
  • Uniform cracking clay soil.
  • Strongly alkaline soil.
  • Self-mulching surface, friable. Subplastic (feels lighter than lab tests suggest).
  • Red upper subsoil, indicating oxidation and little restriction to water and gas movement, despite clay content.
  • Strongly calcareous in surface and upper subsoil, decreasing with depth.
  • Subsoil sodic, becoming strongly sodic with depth. Magnesium also increases with depth.
  • High salt content below 65 cm.
Site
WIA5
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
0–10
8.8
NA
0.18
0.01
19.5
4
2.1
1
NA
1.2
25.8
14.7
25
22
8
44
B21
10–30
9.1
NA
0.22
0.03
15.6
9.7
1.8
4.7
NA
NA
NA
24.9
19
18
5
57
B22k
30–65
9.3
NA
0.75
0.07
10.2
13.8
1.9
8.8
NA
NA
NA
33.3
18
15
3
57
B23k
65–100
9.1
NA
1.6
0.17
6.9
12.9
2
12.7
NA
NA
NA
26.2
13
14
8
58
B24k
100–145
8.9
NA
2
0.24
7.5
15.9
2.2
14.1
NA
NA
NA
27.1
10
9
7
58
B31
145–180
8.9
NA
2.01
0.27
NA
NA
NA
NA
NA
NA
NA
NA
12
15
8
65
B32
180–215
8.9
NA
2
0.31
NA
NA
NA
NA
NA
NA
NA
NA
9
11
8
59
Note: NA=not assessed
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