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LP106

Australian Soil Classification: Magnesic Mesonatric Brown SODOSOL (moderately gravelly surface)
Northocte Factual Key: Db 1.23
Great Soil Group: No suitable group

Site Description: Footslope of sedimentary hill.
Geology: Sandstone/siltstone (Ordovician).


LP106 Landscape image


Soil Profile Morphology

Surface Soil

A1 0-5 cmDark brown (7.5YR3/4); sandy loam; weak medium blocky structure; very firm consistence dry; many fine siltstone gravels; pH 5.8; abrupt and wavy change to:
LP106 profile image

LP106 Profile
A25-20 cmReddish brown (2.5YR5/4), conspicuously bleached pink (10YR7/3); sandy loam;massive structure; strong consistence dry; many fine siltstone gravels ; pH 6.8; abrupt and wavy change to:
Subsoil
B220-30 cmDark yellowish brown (10YR3/6); sandy clay; massive; strong consistence dry; abundant medium sized siltstone gravels ; pH 8.6; gradual and wavy change to:
B/C30-60 cmStrong brown (7.5YR5/6); medium heavy clay; 70% weathering siltstone; strong very fine blocky structure; very strong consistence dry; pH 9.7; diffuse change to:
C60+ cmWeathering siltstone.

Key Profile Features
  • Strong texture contrast between surface (A) and the top subsoil (B21) horizon.
  • High content of alluvial gravel in the surface horizons.
  • 70% rock (siltstone) at 30 cm becoming 100% at 60 cm

Key Profile Characteristics

pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acidic
Medium
Strongly Sodic
Moderately Dispersive1
Subsoil
(B21 horizon)
Strongly Alkaline
Low
Strongly Sodic
Strongly Dispersive
Deeper subsoil
(60 cm)
Extremely Alkaline
Low
Strongly Sodic
Strongly Dispersive
1 Completely dispersed after remoulding


LP106 graphs
The surface is moderately acid. The subsoil is alkaline.The salinity rating in the surface is medium, and low in the subsoil.
This profile is strongly sodic.Low clay content in the surface, with a sharp increase at the A/B interface.





Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Organic Carbon
%
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)
%
Wilting Point
% w/w
Ca
Mg
K
Na
meq/100g
A1
0-5
5.8
4.7
0.13
4.8
2.7
3.8
0.52
1.3
18
33
22
24
11.4
A2
5-20
6.8
5.0
0.05
1.1
3.4
0.19
0.97
B21
20-30
8.6
7.1
0.10
1.4
9.3
0.39
1.9
6
18
51
51
16.2
B22
30-60
9.7
7.9
0.44
0.58
12
0.59
6.3

Management Considerations:
Whole Profile
  • The entire profile is strongly sodic and dispersive (and has a low calcium: magnesium ratio with depth) which will result in restricted root and water movement in the subsoil. Water is likely to build up on the surface and in the surface horizons (as they are more porous) after heavy rains causing waterlogging and surface runoff. This soil is likely to be very susceptible to erosion

Surface (A) Horizons
  • The very gravelly (30%) surface horizons may deflect roots of species that have a tap root system.
  • The surface horizons have a low inherent fertility (based on the sum of the basic exchangeable cations).

Subsoil (B) Horizons
  • The subsoil has a high percentage of exchangeable magnesium (67% increasing to 77% with depth). Nutrient imbalances may occur as a result (e.g., calcium and potassium deficiency).



Profile Described By: Mark Imhof, Paul Rampant and Karen DePlater, November 1995
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