Geoscience Reference
In-Depth Information
EC
Effect on crops
0-2
Negligible
2-4
Sensitive crops reduced yield
4-8
Many crops reduced yield
8-16
Only tolerant crops yield satisfactorily
> 16
Only few very tolerant crops yield satisfactorily
Plate 18.20
Solodized Solonetz soil (FAO: Eluvial Solonetz)
with amorphous silica derived from the breakdown of clays
under the very strongly alkaline pH.
Photo: Ken Atkinson
Increasing Rainfall, Leaching and Profile Differentiation
Solodized
Solonetz
Solodic
Planosol
Solonchak
Solonetz
cm
pH
7.5
pH
8.0
pH
6.0
6.0
pH
0
A
A
A
A
5.5
E
A
7.5
Bt
9.5
E
5.0
25
Bt
7.5
C
8.5
Btg
9.5
Bt
5.5
Btg
8.0
50
Bn
10.0
Bn
9.0
Btg
6.5
C
8.5
75
Explanation of horizons:
A Eluvial, non-bleached
E Eluvial, bleached
Bt Illuvial with clay accumulation and columnar structure
Btg Gleyed, illuvial with clay accumulation
Bk
C
8.0
Bk
6.5
100
Illuvial with lime (CaCO
3
) accumulation
C
7.0
Bn
Sodium dominated
125
C
Weathered parent material
Figure 18.14
Environmental and evolutionary relationships of Solonchak, Solonetz, Solodized Solonetz and Solodic
Planosol soils.
