Quality of Ground Waters for Irrigation

Water Quality	EC (dS/m)	SAR (mmol/L)	RSC (me/L)
Good water	< 2	< 10	< 2.5
Marginally saline water	2 – 4	< 10	< 2.5
Saline water	> 4	< 10	< 2.5
High SAR saline water	> 4	> 10	< 2.5
Marginally alkali water	< 4	< 10	2.5 – 4
Alkali water	< 4	< 10	> 4
Highly alkali water	Variable	> 10	> 4