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ALRA81

WLRA - soil pit ALRA81 - landscape
Overlooking alluvial plains of Mt William Creek
    Site Code
ALRA81


WLRA - soil pit ALRA81 - profile

    Location

Jallukar Hills, Jallukar

    Landform

Rolling hills

    Geology

Cambrian volcanics

    Element

Hillslope

    Slope

12%

    Aspect

West
Horizon
Depth (cm)
Description

A1

0–10

Very dark greyish brown (10YR3/2); sandy loam; very fine moderate subangular blocky structure; rough-ped fabric; weak to very weak consistence when dry; water repellent; common fine to medium angular/subangular/subrounded metamorphic; sedimentary and quartz coarse fragments; pH 5.5; clear and smooth boundary to:

A2

10–20

Brown (7.5YR4/4); sporadically bleached (10YR8/2); clayey sand (coarse sandy); massive structure; rough-ped fabric; weak consistence when dry; many (50%) fine to medium gravelly subangular and subrounded metamorphic and sedimentary coarse fragments; pH 6.5; abrupt and wavy boundary to:

B2

20–60

Yellowish red (5YR4/6) with common medium distinct light olive brown (2.5Y5/4) mottles; medium heavy clay; moderate medium to coarse angular blocky structure; rough and smooth-ped fabric; very firm consistence when moderately moist; few fine to medium gravelly angular; subangular and subrounded metamorphic and sedimentary coarse fragments; pH 8.0; diffuse and irregular boundary to:

B3

60–70

Yellowish red (5YR4/6); medium clay; strong fine angular blocky structure; smooth-ped fabric; firm consistence when moderately moist; many (50%) fine medium to coarse angular; subangular and subrounded metamorphic and sedimentary coarse fragments; pH 8.0; sharp and irregular boundary to:

C

70+

Consolidated bedrock.
Management considerations
  • Soil depth is relatively shallow with many coarse fragments throughout
  • Sloping terrain and shallow depth to bedrock leads to high runoff and sheet erosion potential
  • Shallow loam and sandy topsoils
  • Strong texture contrast soil with strong hard bleach on contact with subsoil
  • Acidic surface with neutral to alkaline trend with depth
  • Differential soil water movement likely (subsurface drainage) Mottling indicating some restrictive drainage in subsoil
  • Moderate to susceptibility to compaction (relatively shallow topsoil and clayey subsoil)
  • Very slight dispersion in topsoil but very highly dispersive in subsoil
Site
ALRA81
Sample depth cm
pH
EC
dS/m
NaCl
%
Organic Carbon
%
Ex Ca
cmol-/kg
Ex Mg
cmol-/kg
Ex K
cmol-/kg
Ex Na
cmol-/kg
Ex Al
cmol-/kg
Ex acidity
cmol-/kg
FC
-30okPa
PWP
-1500okPa
KS
%
FS
%
Z
%
C
%
Horizon
H2O
CaCl2
A1
0–10
5.5
4.9
0.25
NA
3.6
3.5
1.4
1.2
0.79
<10
9.1
20.8
8.0
21.9
45.1
13.5
9.5
A2
10–20
6.9
6.5
0.09
NA
NA
2.3
1.2
0.49
0.44
NA
2.9
16.5
9.1
24.6
48.0
15.0
7.0
B2
20–60
7.5
6.7
0.27
0.04
NA
5.4
14.0
0.9
3.4
NA
NA
37.5
19.8
9.7
25.8
11.5
51.5
B3
60–70
7.7
6.9
0.4
0.06
NA
4.5
11.0
0.7
4.3
NA
NA
32.9
16.1
NA
NA
NA
NA

Note: NA=not assessed
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