Treat this as a regional ...

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Treat this as a regional problem

Salinity occurs in low lying areas with saline groundwater table.  These low lying areas are basically discharge zones for the surrounding areas.  So, better irrigation management in the region to avoid excessive percolation is essential.  Then find ways to accelerate water in smallest possible area, and explore of these isolated areas can produce economic outputs - so, the solutions minimize negative externality and financially viable.