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GL39

Location: Mumbannar

Australian Soil Classification: Basic, Petrocalcic, Arenic RUDOSOL (confidence level 4)
General Landscape Description: Gently undulating plain
Site Description: Dune with 4% slope
Land Unit: Nelson Plains and Dunes
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 GL39 auger



Soil Profile Morphology


A10-70 cmDark reddish brown (2.5YR3/4) loamy sand (minus), apedal single grained; pH 7.8; abrupt transition to:


C70+ cmLimestone


Key profile features:
  • Sandy profile
  • Hydrophobic topsoil
  • Shallow soil
  • Sand over limestone
  • Low nutrient status
  • Low available water holding capacity


Soil Profile Characteristics:


-

pH
Salinity
Surface Soil
(A1 horizon)
Slightly Alkaline
Medium
Non-Sodic
None1



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
0-70
7.8
7.3
0.23
1.5
0.13
13
3.7
12
0.76
0.44
0.52
9
63
7
19
20.0
7.6


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