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GL51

Location: Mount Richmond

Australian Soil Classification: Calcareous, Petrocalcic, Orthic TENOSOL (confidence level 4)
General Landscape Description: Undulating rises
Site Description: Upper slope off Dune
Land Unit: Nelson Dunes and Plains
Geology: Quaternary limestone

General Land Unit Description: This land unit occurs in the south western corner of the region. The land unit is generally composed of siliceous sand dunes and plains over calcareous material. The partly consolidated calcareous deposits were formed in an arcuate band (north west / south east trending) formed by the retreat of the Murray Sea. The siliceous dune and sand sheet material is generally of aeolian origin. Although there is a large area of this land unit in the south west of the study area there are also some isolated patches, mainly mixed amongst the Follet land unit that could not be mapped due to restrictions of scale.

The sand varies from orange (GL48), to red (GL39) to a paler colour, represented by this soil type. The orange and red sands are usually associated with the calcareous material, whereas the paler sands tend to have less carbonate (e.g. GL51, GL38) or the calcareous material is greater than 2 metres deep (e.g. GL50). Another soil variant occurs on the swales in between the dunes. This soil tends to have a heavier textured subsoil which may or may not have calcareous material underneath.



Soil pit GL51 auger


Soil Profile Morphology

A10-20 cmDark brown (10YR3/2) sand, apedal single grained, pH 6.3; transition to:


Subsoil


B2120-50 cmBrown (10YR5/3) sand, apedal single grained, pH 6.7; transition to:


B2250-80 cmStrong brown (10YR4/6) sand, apedal single grained, pH 6.6; transition to:


B2380-140 cmStrong brown (10YR5/8) sand, apedal single grained, pH 7.0.


BC140+ cmLimestone



Key profile features:
  • Deep sandy profile
  • Limestone at depth


Soil Profile Characteristics:
-

pH
Salinity
Surface Soil
(A1 horizon)
Slightly Acid
Low
Non-Sodic
None
Subsoil
(20-50 cm)
Slightly Acid
Low
Non-Sodic
None
Deeper Subsoil
(80-140 cm)
Neutral
Low
Non-Sodic
None

Soil pit GL51 graphs


Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
Organic Carbon
%
Total
Nitrogen
%
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
0-20
6.3
5.5
0.07
0.86
<0.05
3.8
3.4
0.41
0.12
0.09
75
13
1
12
4.1
1.5
B21
20-50
6.7
6.1
0.06
2.1
1.4
0.14
0.10
<0.05
74
15
1
10
2.7
1.0
B22
50-80
6.6
6.0
0.05
1.8
0.68
0.12
0.09
<0.05
74
23
2
2
3.6
1.0
B23
80-140
7.0
6.4
0.06
1.3
0.64
0.07
0.09
<0.05
77
20
2
1
8.8
0.7


Profile Described By: Natalie Baxter and Grant Boyle, 3rd October 2000.
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