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WLRA148

WLRA - soil pit WLRA148- landscape
Lucerne on an alluvial plain
    Site Code
WLRA148
WLRA - soil pit WLRA148- profile
Calcic, Mottled-Subnatric, Grey Sodosol

    Location

Landsborough Road, Joel, western Victoria

    Landform

Alluvial plain

    Geology

Quaternary recent alluvium: fluvial gravel, sand, silt

    Element

Plain

    Slope

<1%

    Aspect

East
Horizon
Depth (cm)
Description

A1

0–15

Brown (10YR5/3); sandy loam; strong fine subangular blocky, parting to fine to very fine granular structure; rough-ped fabric; weak dry consistence; common medium to coarse and fine to very fine roots; slightly water repellent; pH 6.0; abrupt and smooth boundary to:

A2

15–45

Light brownish grey (10YR6/2); conspicuously bleached very pale brown (10YR8/2); silty loam; massive (structureless); firm dry consistence; common medium to coarse roots, few fine to very fine roots; pH 7.0; abrupt and irregular boundary to:

B21

45–70

Dark greyish brown (10YR4/2) with many medium distinct (5YR4/6) mottles; medium heavy clay; strong medium prismatic, parting to fine subangular blocky structure; smooth and rough ped-fabric; very strong dry consistence; few distinct mangans; common medium to coarse and common fine to very fine roots; pH 7.5; clear and smooth boundary to:

B22

70–110

Yellowish brown (10YR5/8); light clay; massive (structureless); very firm dry consistence; few medium to coarse calcareous nodules and soft segregation patches; common medium to coarse and few fine to very fine roots; pH 9.0; gradual and smooth boundary to:

B3

110–140+

Yellowish brown (10YR5/6); silty clay loam; massive (structureless); very firm dry consistence; few medium to coarse calcareous nodules and soft segregation patches; common medium to coarse and few fine to very fine roots; pH 9.0.
Management considerations
  • Texture contrast profile, occasionally gradational; sodic subsoil
  • Subsurface horizon is leached (bleached). Fewer nutrients available
  • Slightly acidic surface and subsurface soil and alkaline subsoil
  • Note high fine sand content throughout
  • Less clay with deeper subsoil and higher proportion of magnesium to calcium at depth
  • Red mottling of upper subsoil; some minor drainage restrictions. Carbonate at depth.
  • Subsoil is highly dispersive. Limited (preferably no) exposure required to remain stable. Slight salinity potential at depth.
  • Surface and subsurface soil is only slightly dispersive
  • Landscape position, alluvial plain. Water shedding potential is low
Site
WLRA148
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
0–15
5.6
5
0.11
NA
4.4
1
0.93
0.09
<10
NA
29.8
6.9
2.6
56.2
12.5
27.5
A2
15–45
5.8
5.2
0.05
NA
1.4
0.79
0.09
0.16
<10
NA
18.8
3.7
2
63
13
17.5
B21
45–70
7.8
7
0.18
NA
3.7
6.4
0.82
1.8
NA
NA
27.6
14.4
0.4
36.9
22
35.5
B22
70–110
8.8
8.2
0.25
NA
2
5.1
0.46
1.6
NA
NA
NA
NA
NA
NA
NA
NA
B3
110–140+
8.7
8.2
0.4
0.08
1.4
5.4
0.5
1.2
NA
NA
24.7
7.4
0.2
69.6
11.5
15.5
Note: NA=not assessed
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