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BD7

BD7 landscape
Undulating granite rise

    Site Code
BD7


BD7 profile
Mesonatric, Mottled-mesonatric, Grey Sodosol
    Location
Lal Lal
    Landform
Undulating rises
    Geology
Devonian granite
    Element
Hillslope
    Slope
7–10%
Horizon
Depth (cm)
Description

A1

0–18

Very dark grey (10YR3/1); sandy loam; moderate structure;
friable; pH 6.0; abrupt boundary to:

A2

18–52

Pale brown (10YR6/3); clayey sand;
apedal massive structure; pH 5.5; clear boundary to:

B2


52–100+


Light brownish grey (10YR 6/2) with many yellow
mottles; medium clay; weak structure; friable; few gravel fragments; pH 5.0.

Management considerations

Granitic soil in the virgin state is unsuitable for cropping however after several years under pasture, good crops of oats, wheat, barely and peas can be grown where waterlogging is not a problem. In most of the granitic country, the impermeable subsoil or bedrock is too close to the surface (within half a metre) and winter waterlogging results in very disappointing crops. However, there are some localised areas where the topsoil is deep enough or the subsoil permeable enough that waterlogging is not a problem and quite good crops can be grown.


Summer fodder crops and potatoes can be grown, but without irrigation, yields can be poor in dry seasons. Potatoes must be dug in autumn to avoid winter waterlogging.

The granitic soil is best suited for growing pasture. Compared with the heavier soils of the district, granitic soil needs a smaller amount of rain to start autumn growing. Consequently, autumn and winter growth of pastures can be very good. However, because of poor water storing capacity, spring growth usually finishes earlier on the granitic soil than on the heavier soils of the district.

Analytical data

Site BD7
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex Acidity
FC
–10kPa
PWP
–1500kPa
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
5.0
4.3
0.20
N/R
0.27
2.5
0.08
1.1
99
N/R
N/R
N/R
N/R
N/R
N/R
N/R
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