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HOR4

    Site Code
HOR4

    Location

South Wonwondah, western Victoria

    Landform

Plain

    Geology

Quaternary Shepparton Formation: fluvial silt, sand and minor gravel

    Element

Flat

    Aspect

0

Horizon
Depth (cm)
Description

A1

0–15

Greyish brown (10YR5/2); light clay; subplastic; cracking and slightly self-mulching surface condition; moderate coarse subangular blocky structure; very strong consistence dry; pH 6.5; clear change to

B2

15–70+

Grey (10YR5/1); heavy clay; subplastic; moderate very coarse prismatic structure; very strong consistence, dry; pH 7.6.
Chemical and Physical Analysis:
Horizon
Depth (cm)
pH (water)
pH (CaCl2)
EC
dS/m
NaCl
%
Exchangeable Cations
cmol-/kg
Field Capacity
(pF2.5)
Wilting Point
(pF4.2)
Ca
Mg
K
Na
A1
0–15
6.5
NA
0.04
NA
8.9
6.4
0.5
1.0
27.3
19.3
B2
15–70+
7.6
NA
0.09
0.2NA
10.1
8.8
0.8
2.6
35.0
15.4


Management Considerations:
  • Cracking clay profile, high clay percentage.
  • Neutral thin surface soil and subsoil, alkaline at depth.
  • Structured surface, occasional self mulching feels lighter than lab data suggests (subplastic).
  • Subsoil is sodic and may be strongly sodic at depth Subsoil does disperse; highly dispersible.
  • Cracking may allow air and seasonal moisture to penetrate.
  • Very strong consistence when dry, implications for compaction and implement use.
  • Landform element, flat: poor site drainage.
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