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OTR499

OTR499 landscape

    Site Code
OTR499



Bleached-Sodic, Eutrophic, Black Kurosol
    Location
Anglesea
    Landform
Hills
    Geology
Palaeogene Demons Bluff Formation
    Element
Hillslope - mid slope
    Slope
0%
    Aspect
-
Horizon
Depth (cm)
Description
A1
0–10Black (10YR2/1); loamy fine sand; apedal single grain structure; gradual boundary to:

A2
10–30Grey (10YR5/1); loamy fine sand; apedal single grain structure; clear wavy boundary to:

B21
30–50Very dark greyish brown (10YR3/2); sandy clay loam; weak coarse (40 mm) subangular blocky structure; organic stains on ped faces; diffuse boundary to:

B22
50–120Dark yellowish brown (10YR4/4); sandy clay loam; coarse (40 mm) subangular blocky structure; clay skin cutans; diffuse boundary to:

C
120+Yellowish brown (10YR5/6); sandy clay; apedal massive structure.

Management considerations
The sandy topsoil generally has poor plant water and nutrient holding capacities and due to the low level of bonding between soil particles are particularly prone to wind erosion where land is cleared. Sheet and rill erosion (depending on organic matter content and vegetative cover) may also be an issue. The soils are possibly hydrophobic (in conjunction with organic coatings) when dry, taking time to reabsorb moisture. Sandy topsoils do however drain rapidly and maintenance of a vegetative cover is important. The acidic soils restrict the uptake of certain nutrients as well as intolerance for some plant species (due in part to the increasing mobilisation of aluminium and manganese). Sodic subsoils usually have poor structure (generally as coarse domed columns). The poor structure results in dispersion (and subsequent clogging of pores), restricting water and gas movement through the subsoil. These soils are hardsetting and have limited opportunity for cultivation without further damage to soil structure. Deficiencies of calcium, potassium and molybdenum are likely.

Analytical data
Site OTR499
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
FC
(-10kPa)
PWP
(-150kPa)
KS
FS
Z
C
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
%
%
%
%
%
%
A1
0-10
4.7
N/R
0.052
N/R
2.5
0.9
0.1
0.04
N/R
N/R
N/R
N/R
1
83
6
7
A2
10-20
4.6
N/R
0.037
N/R
0.9
0.2
0.07
0.01
N/R
N/R
N/R
N/R
1
84
10
6
A2
20-30
4.9
N/R
0.021
N/R
0.5
0.3
0.03
0.01
N/R
N/R
N/R
N/R
<1
90
3
7
B21
40-50
5.3
N/R
0.060
N/R
1.2
2.5
0.2
0.2
N/R
N/R
N/R
N/R
1
69
5
22
B22
110-120
5.2
N/R
0.258
N/R
0.9
3.3
0.1
0.8
N/R
N/R
N/R
N/R
<1
65
4
29
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