Classification scheme

Categories

Range (mg/L)

Number of samples

Hand Dug Well (Wet Season)

Hand Dug Well (Dry season)

Borehole (Wet Season)

Borehole (Dry season)

Sodium adsorption ratio (SAR)

Excellent

<10

15

15

15

15

Good

>10 - 18

Nil

Nil

Nil

Nil

Fair

>18 - 26

Nil

Nil

Nil

Nil

Poor

>26

Nil

Nil

Nil

Nil

Hard

>200 - 300

Nil

Nil

Nil

Nil

Very hard

>300

Nil

Nil

Nil

Nil

Sodium Percentage (Na%)

Excellent

<20

Nil

Nil

15

15

Good

>20 - 40

5

3

Nil

Nil

Permissible

>40 - 60

7

7

Nil

Nil

Doubtful

>60 - 80

3

5

Nil

Nil

Unsuitable

>80

Nil

Nil

Nil

Nil

Magnesium adsorption ratio (MAR)

Acceptable

<50

13

14

Nil

Nil

Non-acceptable

>50

2

1

15

15

Kelly’s ratio (KR)

Suitable

<1

15

15

Nil

Nil

Unsuitable

>1

Nil

Nil

15

15

Potential soil salinity (PS)

Excellent to good

<5

15

15

15

15

Good to injurious

>5 - 10

Nil

Nil

Nil

Nil

Injurious to Unsatisfactory

>10

Nil

Nil

Nil

Nil