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WIA3

    Site Code
 WIA3
WLRA - soil pit WIA3- profile
Calcic, Subnatric, Red Sodosol

    Location

Coromby, western Victoria

    Landform

Plain

    Geology

Quaternary Woorinen Formation: aeolian dune sand, calcareous clay

    Element

Eroded crest - plain
Horizon
Depth (cm)
Description

A1

0–5

Brown (7.5YR4/4); sandy clay loam; hardsetting surface condition; weak coarse friable granular structure; pH 7.1; sharp and wavy boundary to:

A2j

5–15

Brown (7.5YR4/4) sporadically bleached (10YR7/2d); sandy clay loam; weak coarse friable granular structure; pH 6.2; sharp and wavy boundary to:

B21

15–45

Reddish brown (5YR4/4); light clay; plastic; moderate very coarse prismatic structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 7.7; clear and smooth boundary to:

B22

45–65

Yellowish brown (10YR5/8); medium clay; plastic; moderate coarse subangular blocky structure; strong consistence dry; sticky consistence wet; very few (<2%) hard carbonate segregations; pH 8.9; sharp and broken boundary to:

B23

65–75

Yellowish brown (10YR5/8); medium clay; plastic; very large lenticular structure (slickensides); strong consistence dry; sticky consistence wet; few (2-10%) soft carbonate segregations; rock fragments; pH 9.0.

C

75+

Inpenetrable rock
Management considerations
  • Strong texture contrasts (16% to 79% clay).
  • Neutral upper soil becoming alkaline at depth, high level of nutrients in upper subsoil (B21, B22 horizons)
  • Thin surface and subsurface horizon with, poor structure and high coarse sand component
  • Subsurface soil is leached with fewer nutrients than above or below
  • Subsoil is sodic, with sodicity and salinity higher in upper and mid subsoil (B21 and B22 horizons)
  • Subsoil is reddish in upper subsoil, indicating relatively free drainage and air movement (oxidising conditions), despite clay percentage
  • Landform element, eroded crest-plain; moderate site drainage
Site
WIA3
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
7.1
6.4
0.06
0.01
3.1
0.4
0.6
NA
NA
2.9
NA
4.7
45
23
13
14
A2j
5–15
6.2
NA
0.07
0.01
2.4
0.8
0.4
0.1
NA
3.3
13.1
4.8
43
24
15
16
B21
15–45
7.7
6.7
0.3
0.02
11.8
12
2.5
3.3
NA
7.1
NA
30
10
6
3
79
B22
45–65
8.9
NA
0.46
0.02
10.5
12.4
2.2
3.3
NA
1.5
NA
24
20
12
6
62
B23
65–75
9.0
NA
0.33
0.02
6.8
9
1.6
2.6
NA
1.0
NA
15.9
32
15
8
44
Note: NA=not assessed
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