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LP44

Property: State ForestGeo. Ref: 701955E, 5909000N; ST ARNAUD
Aust. Soil Class.: Bleached, Magnesic, Red KUROSOLNorthcote Factual Key: Dr 3.41
Great Soil Group: red soloth Geology: Cambrian sediments.
General Landscape Description: Mid to upper slope (slope 20%) on mountain ridge located approximately 5 km east of Barkly. Vegetation includes Grey Box (E. microcarpa) and Red Stringybark (E. macrorhyncha).

Photo: Soil Pit Site LP44 Landscape
Soil Site LP 44 Landscape

Soil Profile Morphology

Surface Soil
A10-10 cmBrown (7.5YR4/2); fine sandy loam; weak medium blocky structure; firm consistence dry; pH 5.0:
Photo: Soil Pit Site LP44 Profile
Soil Site LP44 Profile
A210-20 cmYellowish brown (10YR5/4) conspicuously bleached; fine sandy clay loam; structureless; contains very many (50%) angular quartz fragments; pH 5.1:
Subsoil
B120-30 cmYellowish red (5YR5/8) and reddish yellow (5YR6/6); light medium clay; moderate medium to coarse polyhedral structure; strong consistence dry; pH 5.4:
B2130-60 cmDark red (2.5YR4/8); medium clay; strong medium to fine blocky structure; strong consistence dry; quartz floaters occur throughout; pH 5.4:
B2260-90 cmDark red (2.5YR4/8) and brownish yellow (10YR6/6); medium clay; strong medium to fine blocky structure; strong consistence dry; pH 5.6:
C90 cm +Weathered siltstone.

Key Profile Features
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.

Key Profile Characteristics

pH
Salinity Rating
Surface
(A1 horizon)
strongly acid
very low
non-sodic
none
Subsoil
(30 - 60 cm)
strongly acid
very low
non-sodic
none
Deeper subsoil
(60 - 90 cm)
Graph: pH levels in Site LP44
Graph: Salinity levels in Site LP44
Graph: Sodicity levels in Site LP44

Horizon
Horizon Depth
pH (water)
pH CaCl2
EC 1:5
NaCl
Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-10
5
4.2
0.07
4.4
1.9
0.6
0.1
A2
10-20
5.1
4
<0.05
0.1
0.5
0.2
0.1
B1
20-30
5.4
4.2
<0.05
0.1
2
0.4
0.1
B21
30-60
5.4
4.2
<0.05
0.1
4
0.5
0.2
B22
60-90
5.6
4.3
<0.05
<0.1
4.6
0.4
0.3
C
90

Horizon
Horizon Depth
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2-2.0mm)
Fine Sand
(0.02-0.2mm)
Silt
(0.002-0.02mm)
Clay
(<0.002mm)
A1
0-10
87
23.2
A2
10-20
159
9.4
B1
20-30
187
11.2
B21
30-60
304
15.6
B22
60-90
C
90

Management Considerations:
Whole Profile
  • Exchangeable aluminium levels are high throughout the strongly acid soil profile (increasing with depth). These levels will significantly restrict the growth of aluminium-sensitive plant species.
Surface (A) Horizons
  • The surface horizons have a low inherent fertility (based on the sum of the exchangeable basic cations).
Subsoil (B) Horizons
  • Exchangeable magnesium levels are high (ie. greater than 80% of total cations) throughout the subsoil. This may result in nutrient imbalances (e.g. calcium and potassium deficiency).
Notes:
  • Profile described by Mark Imhof, Paul Rampant and Karen De Plater (23/3/95).
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