35 
LEGEND 
PHYSIOGRAPHY 
NATURE OF 
‘DEGREE OF 
EXTENT OF 
AREA 
SALT-AFFECTED SOILS 
SALINITY/SODICITY 
IN MAPPING 
UNIT 
A Alluvial plain 
0 
0 
0 
0 
Aeofluvial / Aeolian / 
Arid plains 
Deltaic plains 
Coastal plains 
Lacustrine Plains 
Peninsular plains 
Mud flats/ 
Mangrove swamps 
Any other 
Saline 
Sodic 
s n 
Saline - Sodic 
Normal soils 
1 Slight 
Moderate 
Strong 
<1/3 : a 
1 /3-2/3 
> 2/3 
EXPLANATION FOR MAPPING UNIT 
A s 2 b 
PHYSIOGRAPHY I L 
NATURE OF SALT-AFFECTED SOILS _ 
EXTENT OF AREA IN MAPPING UNIT 
DEGREE OF SALINITY / SODICITY 
* KEY TO DEGREE OF SALINITY AND /OR SODICITY 
DEGREE 
SALINITY 
SODICITY 
ECe (dS/m) 
pH 
ESP 
SLIGHT 
4- 8 
8.5-9.0 
< 15 
MODERATE 
8 - 30 
9.0 - 9.8 
15- 40 
STRONG 
> 30 
> 9.8 
> 40