For achieving maximum production of crops good quality of water is
essential. Sodium and Electrical conductivity play a vital role in
suitability of water for agricultural purposes. Excess of sodium in water
produces adverse effects by changing permeability and properties of
soil, whereas the excess of EC will affect root zone. Groundwater
suitability of study area was assessed using sodium adsorption ratio
(SAR) classification. The standard guideline established by USDA
Salinity Laboratory to examine the water quality for irrigation practices
based on EC Freeze and Cherry (1979). Study area samples are plotted
in Wilcox’s diagram (1955) to classify the water. Sodium is plotted
against E C.
Based on Wilcox’s diagram classification most of the studied water
samples were fall in C3S1 zone
EC (µS/cm)
<250
250-750
750-2250
USDA CLASSISIFICATION BASED ON E C
Salinity Class
Quality Remarks
C1
Excellent or low
C2
Good to medium
C3
Permissible or High
2250-5000
C4
Unsuitable or Very High
Suitability for irrigation based on Sodium percentage
Sodium
Suitability for irrigation
<20
Excellent
20-40
Good
40-60
Permissible
60-80
Doubtful
>80
Unsuitable