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WLRA140

WLRA - soil pit WLRA140- landscape
Gully erosion of higher slopes

    Site Code
WLRA140
WLRA - soil pit WLRA140- profile
Mottled, Magnesic, Brown Chromosol

    Location

Ararat-St Arnaud Road, Joel South, western Victoria

    Landform

Hill

    Geology

Palaeozoic (Cambrian) Warrak Formation:
marine sandstone, siltstone, schist

    Element

Hillslope

    Slope

15%

    Aspect

West
Horizon
Depth (cm)
Description

A1

0–15

Strong brown (7.5YR4/6); loam, fine sandy; apedal (structureless); firm dry consistence; many small to medium angular quartz and angular platy weakly metamorphosed siltstone; few fine and very fine roots; pH 5.0; clear and smooth boundary to:

B2

15–35

Light olive brown (2.5Y5/4) with many medium distinct (2.5YR4/6) inclusions of substrate material as mottles; silty clay loam; moderate fine to medium subangular blocky structure; smooth ped-fabric; very firm dry consistence; many small to medium angular quartz and angular platy weakly metamorphosed siltstone; few fine and very fine roots; pH 6.0; clear irregular boundary to:

C

35–75+

Weathered weakly metamorphosed siltstone; pH 7.0.
Management considerations
  • Shallow texture contrast profile, slightly acidic
  • Shallow clayey magnesic subsoil, not sodic, overlying weathered sediments (variable depth?). Slightly dispersive
  • Nutrient status of subsoil is high per clay percentage but magnesium is dominant
  • Red mottling, drainage slightly impeded
  • Landscape position, lower and mid slope, highly susceptible to sheet and gully erosion

Site
WLRA140
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
5.4
4.5
<0.05
NA
1.4
1
0.46
0.11
56
NA
25.3
6.3
19.8
45.6
18.5
12
B2
15–35
5.9
4.9
0.06
NA
0.46
11
0.6
0.45
24
NA
33.3
17.9
5
26.3
23
41.5
Note: NA=not assessed
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