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Site GL164

General Land Unit Description:

This site is situated on the level surface of the Dundas Tablelands. Red gums are the dominant vegetation. The dominant soil type is a Brown Chromosol, commonly with a ferric horizon which, in some cases, may be cemented (petroferric). The soil is developed over a highly weathered mottled zone. The mottled zone, sometimes referred to as ‘tiger mottling’, is thought to be the result of fluctuating watertables which occurred mainly in the Tertiary period.

PHOTO: Soil Site GL164 Landscape
Site GL164 Landscape


Site Description:

Slope: 0-1%
Geology: Tertiary marine sandstone.
Landform Pattern: Level plain.
Position in Landscape: Flat.
Internal Drainage: Moderately well drained.

Soil Profile Morphology:

Surface Soil


A10-25 cm Very dark grey (7.5YR3/1) sandy loam; weak medium blocky structure; weak consistence (dry); very few medium angular ferruginised nodules (6-20 mm); pH 6.5; clear and wavy change to:

PHOTO: Soil Site GL164 Profile
Site GL164 Profile
A225-40 cmDark yellowish brown (10YR4/4) fine sandy clay loam; weak to massive medium blocky structure, firm consistence (moist); many medium to coarse ferruginous and manganiferous nodules; pH 4.7; clear and wavy change to:

Subsoil

B240-60 cmDark yellowish brown (10YR4/6) light medium clay (sandy); weak fine blocky structure; firm consistence (moist); many coarse ferruginous and manganiferous nodules; pH 5.5; clear and wavy change to:

BC60-85 cmMainly buckshot; ferruginous and manganiferous nodules are abundant; moderately cemented discontinuous; ferricrete pan; abrupt and wavy change to:

C85-150 cm


Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B) horizons.
  • Ferric pan at base of subsoil.


pH
Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Low
Non-Sodic
None
Subsoil
(40-60 cm)
Strongly Acid
Low
Non-Sodic
None

GRAPH: Soil Site GL164 pH
GRAPH: Soil Site GL164 Salinity
GRAPH: Soil Site GL164 Sodicity
GRAPH: Soil Site GL164 Clay

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC 1:5
Exchangeable Aluminium
mg/kg
Exchangeable Acidity
meq/100g
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-25
6.5
6.0
0.11
7.8
8.1
2.2
0.42
0.38
A2
25-40
4.7
4.0
0.08
220
11
0.54
1.7
0.12
0.4
B21
40-60
5.5
4.6
0.08
53
9.8
1.4
4.0
0.16
0.68
Horizon
Horizon Depth
(cm)
Field
Capacity
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2- 2.0 mm)
Fine Sand
(0.02- 0.2 mm)
Silt
(0.002- 0.02 mm)
Clay
(<0.002 mm)
A1
0-25
20
9
14
54
9
17
A2
25-40
20
9
13
47
8
30
B21
40-60
27
15
10
35
8
47


Profile Described By: Natalie Baxter, Nathan Robinson, Grant Boyle and Mark Imhof (October 2001).

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