Which element is responsible for causing soil salinity? At what concentration does the soil become saline?

Explanation

Soil salinity is the salt content in soil, which is caused by improper irrigation. The process of increasing salt cotent is termed as salinisation.
Causes of Soil Salinity The high salt concentration of soil is caused by improper irrigation method from a salt laden water table. When salt concentration in soil increased, than it get accumulated due to evaporation.
Human activites like fertillising crop is also responsible for salinity of soil. As fertilliser contain potassium, which can form a naturally occuring salt-sylvite. Salinity of soil degrades soil and vegetation. Normally the pH value of soil comprises between `2.2-9.7`, while above which the soil is degrading by salt content.