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Site SW64

Location: Simpson.Australian Soil Classification: Humose-Acidic, Kandosolic, Redoxic HYDROSOL.
General Landscape Description: Gently undulating plain (plateau).Site Description: Gentle slope between plateau and depression.
Geology: Hanson Plain Sand.

Soil Profile Morphology:

Surface Soil

A110-40/45 cmBlack (2.5Y2.5/1), grey (2.5Y6/1 dry) to light yellowish brown (2.5Y6/4 dry); light fine sandy loam; weakly pedal; very weak consistence; moderate amount of roots present; pH 5.1; clear change to:

Image:  GP64 ProfileSouth West Gasp Pipeline GP64 ProfileSite SW64 profile
A1245-55/60 cmGreyish brown (2.5Y5/2 moist and dry); loamy sand; apedal; firm consistence; diffuse change to:

Subsoil

B21g55/60-120 cmYellowish brown (10YR5/8) with light yellowish brown (2.5Y6/3) mottles; clayey sand; apedal; firm consistence; pH 4.8; gradual change to:

B22g120 cm+Light brownish grey (10YR6/2) with very coarse prominent yellowish brown (10YR5/6 and 5/8) mottles; clayey sand; apedal.


Key Profile Features:
  • Thick organic matter rich surface (A1) horizon.

Key Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
-
Subsoil
(B21 horizon)
Very Strongly Acid
Low
Non-Sodic
-

Image:  GP64 Graphs

Image:  GP64 Graphs
South West Gasp Pipeline GP64 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-40
5.1
4.5
0.26
2.3
0.5
0.5
0.3
B21g
55-120
4.8
4.2
0.06
0.09
0.54
<0.05
0.18

Horizon
Horizon Depth
(cm)
Exchangeable
Aluminium
mg/kg
Exchangeable
Acidity
meq/100g
Coarse Sand
(0.2-2.0 mm)
Fine Sand
(0.02-0.2 mm)
Silt
(0.002-0.02 mm)
Clay
(<0.002 mm)
A1
0-40
17
16
37
38
10
5
B21g
55-120
150
5.7
28
42
12
21

Management Considerations:

Whole Profile
  • Soil profile is likely to be saturated for a number of months during most years.

Surface (A) Horizons
  • Manganese toxicity can occur in strongly acid soils, especially when waterlogging occurs. Raising pH by lime application will assist in reducing manganese toxicity.

Notes:
  • The B21 and B22 horizons are saturated especially at the base of the profile. Water is moving from the surrounding soil into the trench, as the water would not pool this high in the trench from direct rainfall. The bottom of the trench has turned “quick” or liquid where the water has been allowed to sit for a period of time. Therefore there is a low clay content which is allowing water to move through the profile, even where the trencher has not dug. The whole profile is very sandy, with a slight increase in clay content further down.
    Profile Described By: Mark Imhof and Richard MacEwan, April 1999.
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