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GL3

Location: Brimboal

General Landscape Description: Level to gently undulating plain
Site Description: Flat
Land Unit: Dundas Redgum
Geology: Cainozoic duricrust

General Land Unit Description: The flat surface of the Dundas Tablelands predominantly consists of Brown Chromosols and to a lesser extent Yellow Chromosols with a ferric horizon, typically occurring above the clay subsoil. The soil is commonly developed over a highly weathered mottled zone. This red and white mottling, sometimes referred to as ‘tiger mottles’, is thought to be the result of deep chemical weathering which occurred during the late Tertiary period. Red gums are the dominant vegetation found on this surface.


Soil pit GL3 landscape


Soil Profile Morphology



A10-15 cmVery dark greyish brown (10YR3/2); loam; weak ssubangular blocky structure; contains very few fine subrounded sedimentary pebbles; pH 5.1; gradual change to:


A215-30 cmDark greyish brown (10YR4/2), bleached (10YR6/3d); sandy loam; weak subangular blocky structure; contains abundant small to medium ferruginised nodules are abundant; pH 5.4; clear change to:


Subsoil


B230-120 cmReddish yellow (7.5YR6/8), with many faint orange and red mottles; fine sandy light clay; moderate very fine subangular blocky structure; contains many angular sedimentary fragments; pH 6.0; clear change to:


B3120-200 cmYellowish red (5YR4/6) , with many fine prominent red and grey mottles; sandy clay loam; moderate fine subangular blocky structure; contains abundant angular sedimentary fragments.


Key profile features:
  • Strongly acidic topsoil
  • Strong texture contrast between topsoil and subsoil
  • Bleached A2 horizon
  • Mottled subsoil
  • Ferric horizon

Soil Profile Characteristics:
-

pH
Salinity
Surface Soil
(A1 horizon)
Strongly Acid
Medium
Non-Sodic
None
Subsoil
(15-25 cm)
Moderatly Acid
Very Low
Non-Sodic
None


Soil pit GL3 graph

Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
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
0-10
5.1
4.4
0.14
53
9.8
1.1
0.75
0.32
0.35
17
55
11
12
41.2
7.3
A2
10-30
5.4
4.7
0.10
31
7.1
0.89
0.74
0.22
0.30
20
54
9
13
45.5
5.5
B2
30-120
6.0
5.6
0.09
<10
8.9
1.4
5.6
0.38
0.40
23
19
8
50
33.5
19.7


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