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OTR490

OTR490 landscape
This was located in the housing estate
    Site Code
OTR490



Calcic, Mesonatric, Brown Sodosol
    Location
Torquay
    Landform
Hills
    Geology
Quaternary alluvium/colluvium
    Element
Hillslope – lower slope
    Slope
5%
    Aspect
South-east
Horizon
Depth (cm)
Description
A1
0–15Very dark greyish brown (10YR3/2); fine sandy loam; weak subangular blocky structure; abrupt boundary to:

B21
15–35Brown (10YR4/3); heavy clay; strong coarse (40 mm) subangular blocky structure; some ironstone gravel; hard when dry; diffuse boundary to:

B22
35–70Yellowish brown (10YR5/4); heavy clay; strong coarse (40 mm) subangular blocky structure; hard when dry; diffuse boundary to:

C
70+Mottled light yellowish brown (10YR6/4); and yellowish red (5YR5/6); sandy clay; moderate very coarse (50 mm) subangular blocky structure; hard when dry.
Management considerations
The strong texture contrast between the surface soil and the subsoil can have a major effect by reducing and/or redirecting the internal drainage and restricting root growth beyond the upper horizons. Soil salinity at depth may affect deeper rooting plants and may indicate water movement restrictions. The sandy topsoil is likely to have poor plant water holding capacity and poor nutrient holding. These soils may be hydrophobic (in conjunction with organic coatings) when dry, taking time to reabsorb moisture. Acidic surface soil (topsoil) are often associated with sandy surfaces due the lack of base minerals and may or may not have organic matter (humose or peaty surfaces). The subsoils usually have poor structure (generally as coarse domed columns) resulting in dispersion (and subsequent clogging of pores), restricting water and gas movement through the subsoil. The soils are hardsetting and have limited opportunity for cultivation without further damage to soil structure.

Analytical data
Site OTR490
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
5.3
N/R
0.076
0.011
3.3
1.4
0.1
0.3
N/R
N/R
N/R
N/R
30
51
6
9
A1
10-15
5.5
N/R
0.083
0.011
2.6
1.3
0.1
0.4
N/R
N/R
N/R
N/R
31
50
6
10
B21
20-30
6.6
N/R
0.280
0.028
5.0
7.5
0.4
3.4
N/R
N/R
N/R
N/R
15
22
2
59
B22
50-60
8.2
N/R
0.510
0.048
3.6
9.1
0.3
4.1
N/R
N/R
N/R
N/R
13
13
<1
67
C
100-110
8.1
N/R
0.110
0.045
2.5
6.8
0.4
4.1
N/R
N/R
N/R
N/R
23
23
1
50
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