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GL54

Location: Bolwarra

Australian Soil Classification: Mottled, Eutrophic, Red FERROSOL
General Landscape Description: Gently undulating plan
Site Description: Lower hill slope
Land Unit: Gorae Basalt
Geology: Quaternary basalt

General Land Unit Description: This soil type occurs in isolated patches between Portland and Dartmoor. It usually occupies small areas in between pockets of less productive soil (Ferric Brown Chromosols). The Chromosols have been used to represent this area as they are deemed to be the major soil type, and due to restrictions of scale this soil type has not been mapped as an individual unit. It must be noted however, that this soil type has a higher capability of supporting a range of land uses (e.g. viticulture) due to its favourable physical and chemical properties.

Soil pit GL54 auger



Soil Profile Morphology

A10-25 cmDark brown (7.5YR3/3) sandy clay loam, strong polyhedral structure (2-5 mm), firm consistence when dry, few small subrounded ferruginous and manganiferous nodules (2-5 mm), pH 6.4; transition to:


Subsoil


B2125-50 cmReddish brown (5YR4/4) light clay, many very faint red mottles, medium (5-10 mm) to strong polyhedral structure (2-5 mm), strong consistence when dry, a few small subrounded ferruginous and manganiferous nodules, pH 6.5; transition to:


B2250-110 cmReddish brown (5YR4/4) light clay, many prominent red weathered basalt inclusions, medium to strong polyhedral structure (5-10 mm), strong consistence when dry, pH 6.4; transition to:


B3110+ cmBrown (7.5YR4/4) light clay, many prominent red weathered basalt inclusions, medium to strong polyhedral structure (5-10 mm), very firm to strong consistence when dry, pH 6.5.



Key profile features:
  • High in free iron
  • Well structured soil



Soil Profile Characteristics:
-

pH
Salinity
Surface Soil
(A1 horizon)
Slightly Acid
Medium
Non-Sodic
None
Subsoil
(B21 Horizon)
Slightly Acid
Low
Non-Sodic
None
Deeper Subsoil
(70-140 cm)
Slightly Acid
Low
Non-Sodic
None


Soil pit GL54 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
0-30
       6.4       6.0      0.30
4.1
0.27
18
        12
11
4.8
1
0.5
9
31
16
34
      38.2      20.1
B21
30-50
       6.5       6.1      0.21        12
4.7
6.1
0.62
1
6
31
17
53
      45.4      23.7
B22
50-70
       6.4       6.0      0.24
12
        13
3.6
6.6
0.64
1.2
5
16
12
62
      44.2      26.3
B3
70-140
       6.5       6.1      0.18        12
2.7
6.4
0.49
1
2
17
12
66
      52.3      30.4



Profile Described By: Natalie Baxter and Grant Boyle, 4th October 2000.
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