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GL12


Location: Nangella

Australian Soil Classification: Vertic, Subnatric, Brown SODOSOL (confidence level 1)
General Landscape Description: Rolling low hills and rises
Site Description: Lower 12 % slope
Land Unit: Merino Tablelands
Geology: Cretaceous non-marine sandstone

General Land Unit Description: This unit consists of the Cretaceous non-marine sandstone of the dissected Merino Tablelands. The tablelands were thought to have formed under swamp conditions and a warm climate. As a result, the soils tend to be high in clay and there tends to be carbon rich seams of charcoal deposits at depth in some of the profiles. The main soil type used to represent this land unit is black cracking clays (Vertosols) that can be sodic at depth. This soil type, along with Black Sodosols, Chromosols and Dermosols, are commonly found on the broad crests or drainage lines. The slopes often consist of Brown Chromosols, Sodosols or Dermosols, although black soils can also occur on the slopes. The lower slopes commonly have Grey Vertosols or Sodosols as the major soil type. The reasonably deep sodic soils on short steep slopes tend to be prone to landslips. The grey soils, in particular are prone to water erosion.

Soil pit GL12 landscape


Soil Profile Morphology



A10-5 cmVery dark greyish brown (10YR3/2); sandy loam; weak fine subangular blocky structure; weak consistence, dry; pH 5.4; changes to:


A25-35 cmDark brownish grey (10YR4/2); fine sandy clay loam; massive structure; very firm consistence, dry; contains very few ferruginised nodules; pH 5.8; changes to:


Subsoil


B235-70 cmDark brown (10YR3/3), with very few faint yellow mottles from oxidised roots; medium clay; strong lenticular structure; very strong consistence, dry; pH 6.5; gradual change to:


B370-90 cmDark brown (10YR3/3); light clay; very strong consistence, dry; organic staining present; pH 7.8.


Key profile features:
  • Acidic topsoil
  • Sodic subsoil
  • Top of the subsoil dispersive when worked when wet


Soil Profile Characteristics:
-

pH
Salinity
Surface Soil
(A1 horizon)
Strongly Acid
Medium
Non-Sodic
None
Subsoil
(35-70 cm)
Slightly Acid
Low
Sodic
None1
Deeper Subsoil
(45 -60 cm)
Slightly Alkaline
High
-
-
1 Complete dispersion after remoulding (20 hrs).

Soil pit GL12 graphs

Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
Organic Carbon
%
Total
Nitrogen
%
Exchangeable Aluminium
ppm
Exchangeable Acididty
meq/100g
Exchangeable Cations
Coarse Sand
(0.2-2.0 mm)
%
Fine Sand
(0.02-0.2 mm)
%
Silt
(0.002-0.02 mm)
%
Clay
(<0.002 mm)
%
Field Capacity
% w/w
Wilting Point
% w/w
Ca
Mg
K
Na
meq/100g
A1
0-5
5.4
4.6
0.19
3.1
0.27
16
10
2.2
1.9
0.74
0.76
31
32
14
16
23.3
8.6
A2
5-35
5.8
4.6
0.09
32
6.7
1.3
2.2
0.41
0.78
30
32
17
21
20.4
7.7
B2
35-70
6.5
5.3
0.22
11
4.3
9.8
0.96
4.3
14
18
16
51
45.1
23.3
B3
70-90
7.8
7.0
0.65

Profile Described By: Grant Boyle and Natalie Baxter, 1st October 2000.
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