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Question
A soil has an Exchangeable Sodium Percentage (ESP) of 16% and its Electrical conductivity (EC) is 4.2 milli-mhos/cm. If the pH of this soil is 8.1, then the soil is classified as : 
A.
Alkaline soil
B.
Saline soil
C.
Saline alkali soil
D.
None of the above
Answer ( Option C)

Saline alkali soil

Solution

The classification of saline and alkaline soils is as follows :

 

Classification

Electrical Conductivity (EC) in micro-mho/cm

Exchangeable Sodium Percentage (ESP)

pH value

1.

Saline soil or white alkali

< 4000

< 15

≤ 8.5

2.

Alkaline soil or Non-saline alkali or sodic soil or black alkali

< 4000

> 15

8.5 to 10.0

3.

Saline-alkali soil

> 4000

> 15

< 8.5
 

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