Central Rice Research Institute Annual report...2011-12

Fig. 22. Post monsoon EC (1:2) and site specific fertilizer recommendation (SSFN) map of Ersama Block of
Jagatsinghpur District, Odisha
Mapping of saline rice growing areas of east
coast of India using RS and GIS
To assess the salinity in Balasore and Bhadrak districts
of Odisha, soil sampling was done in five blocks,
viz., Bhograi, Baliapal, Balasore, Remuna and
Bahanaga of Balasore district and two blocks
Basudebpur and Chandbali of Bhadrak district during
pre-monsoon period of 2011. Soil samples were analyzed
for soil electrical conductivity (EC e
) and pH. Soil
EC e
varied from 0.80 to 17.9 dS m -1 . The data was subjected
to geo-statistical analysis, using appropriate
spherical variogram, pre-monsoon salinity map of the
seven blocks was generated in the GIS platform using
ArcGIS 10. Landsat satellite data synchronizing with
the soil sampling was procured from USGS data centre.
Satellite data was pre processed before its final utilization.
Georectification and radiometric corrections
of satellite data was performed. DN values were converted
to top of atmospheric reflectance by standard
procedures specified for landsat bands. Maps for salinity
were generated based on regression fitting of these
indices and soil EC e
values (Fig. 23).
Fig. 23. (a) Coastal Blocks of Balasore and Bhadrak with highlighted Blocks used for this study. (b) Pre-monsoon
salinity map generated using ArsGIS.
68 CRRI ANNUAL REPORT 2011-12