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Table А.9. Soil grouping according to the content of carbonates
Soil grouping by the content of  carbonates
The content of  carbonates of  earth metals, %
Weakly calcareous
≤
 2
Calcareous
2-15
Medium calcareous
15-25
Strongly calcareous
25-50
Very strongly calcareous
>50

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Soil salinity manаgement manual | Part II.Tutorial examples, guidelines and exercises 
Table А.10. Soil grouping according to the presence of highly calcareous layers (more than 30% 
CaCO
3
) within the soil profile and bedrock [11].
№
Parameters
Criteria
1
The upper boundary of  a highly calcareous layer, cm
-at the top 
<30
-within the upper part of  profile   30-60
-within the middle part of  profile  60-100
-within the lower part of  profile 
100-200
-at the bottom 
>200
2
The thickness of  a highly calcareous layer, cm
-thin <40
-medium 40-100
-thick >100
3
The consistency of  a highly calcareous layer
-loose
-sporadically compacted
-continuiously compacted
А5. Distribution of salt-affected soils in some countries of the Eurasian 
Region (a b rief overview).