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NA172


    Location

Mount Arapiles, western Victoria

    Landform

Hills

    Geology
Silurian-Devonian Grampians Group: quartz sandstone and red siltstone

    Element

Footslope

Horizon
Depth (cm)
Description

A1

0–5

Dark greyish brown (10YR3/2);
loamy sand; single grain (structureless)weak dry consistence; pH 7.2; occasional bleach; sharp boundary to:

B21

5–20

Yellowish brown (10YR5/6);
sandy clay loam; weak coarse prismatic structure; rough ped- fabric; very strong dry consistence; gradual boundary to:

B22

20–70+

Dark brown (10YR4/34) with many fine distinct (10YR4/4) mottles;
sandy clay loam; very strong dry consistence; pH 8.9.

Management Considerations

  • Strong texture contrast profile, strongly sodic subsoil.
  • Occasional subsurface horizon, leached (bleached) with restrictive interface with subsoil.
  • Neural surface soil and alkaline deeper subsoil.
  • Deeper subsurface and subsoil are very highly dispersive. Limited (preferably no) exposure necessary to remain stable.
  • Surface soil is only slightly dispersive.
  • Landscape position as footslope; exposure will accelerate rill/gully erosion in susceptible areas( depressions/drainage lines).

Horizon
Depth (cm)
pH (water)
pH (CaCl2)
EC
dS/m
Exchangeable Cations
cmol-/kg
Field Capacity
(pF2.5)
Wilting Point
(pF4.2)
Ca
Mg
K
Na
A1
0–5
7.2
6.8
0.12
8.2
3.3
0.8
0.3
21.7
11.6
B21
5–20
B22
20–70+
8.9
7.5
0.12
5.8
5.9
0.7
2.5
31.7
18.6
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