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LS17

WLRA - soil pit LS17- landscape
Dune crest on a dunefield south of the Big Desert
    Site Code
LS17
WLRA - soil pit LS17- profile
Calcic, Mottled-Subnatric, Yellow Sodosol

    Location

Perenna, western Victoria

    Landform

Dune

    Geology

Quaternary Woorinen Formation: aeolian dune sand, calcareous clay

    Element

Dunecrest
Horizon
Depth (cm)
Description

A1

0–10

Light yellowish brown (10YR6/4); loamy sand; weakly structured; pH 7.7.

A2

10–15

Light yellowish brown (10YR6/4); conspicuously bleached fine sand; pH 8.6; sharp and wavy boundary to:

B21

15–30

Light yellowish brown (10YR6/4) with (10YR6/6) mottles; coarse sandy clay loam; weak to moderate coarse columnar structure (with hard bleached capping); strong consistence (dry); pH 8.9; clear and wavy boundary to:

B22k

30–60

Light yellowish brown (10YR6/4) with (5YR5/6) mottles; light medium clay (sandy); moderate coarse prismatic; parting to strong coarse blocky structure; ped faces may have a discontinuous carbonate coating; pH 9.4.

B31k

60–100

Red (2.5YR4/8) with (7.5YR5/6) mottles; coarse sandy clay loam; massive (structureless); strong consistence (dry); contains few (5%) calcareous nodules; pH 9.6.

B32

100–150

Light yellowish brown (10YR6/4) with (5YR5/6) mottles; medium clay (sandy); moderate medium blocky structure; contains very few (<2%) hard carbonate nodules; pH 9.8.

B33

150+

Yellowish red (5YR5/6) with (10YR6/4) mottles; medium clay (sandy); pH 9.8.
Management considerations
  • Distinct soil texture contrast between sandy surface (A) horizons and clay subsoil (B21) horizon.
  • Soft surface soil condition (ie. not hard setting).
  • Thin conspicuously bleached A2 horizon, few nutrients
  • Alkaline profile, strongly sodic at depth
  • Coarse columnar structure with hard bleaching capping at top of B horizon. Restrictive internal drainage
  • Calcium carbonate evident in upper and mid subsoil
Site
LS17
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
7.7
7.1
<0.05
NA
0.9
0.4
0.2
0.1
NA
NA
2.9
1.4
NA
NA
NA
NA
A2
10–15
8.6
7.9
<0.05
NA
0.6
0.2
0.1
0.1
NA
NA
1.9
1.1
NA
NA
NA
NA
B21
15–30
8.9
7.8
0.15
NA
4.8
4.6
0.7
1.7
NA
NA
19.1
11.3
NA
NA
NA
NA
B22
30–60
9.4
8.5
0.32
<0.05
6.7
8
1.2
3.4
NA
NA
NA
NA
NA
NA
NA
NA
B31
60–100
9.6
8.4
0.2
NA
3.4
5.7
0.7
2.9
NA
NA
NA
NA
NA
NA
NA
NA
B32
100–150
9.8
8.8
0.46
<0.05
3
8
1
7.5
NA
NA
NA
NA
NA
NA
NA
NA
B33
150+
9.8
8.8
0.55
<0.05
2.9
7.8
1
7.9
NA
NA
NA
NA
NA
NA
NA
NA
Note: NA=not assessed
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