Figure.4. Correlative plots for Surface Electrical Conductivity and VH backscatter (A to C) and VV polarization backscatter (D to F)
since SAR waves interact with the surface, but it’s the root zone soil salinity that affects the plant growth hence its important to establish a correlation between surface soil salinity that interacts with the RADAR waves and the root zone soil salinity. This is done to establish an indirect relation between RADAR backscatter and root zone electrical conductivity (which is indicative of soil salinity). So that, satellite data could be used for modelling and estimation of soil salinity in root zone.
Figure 5, shows the correlative relation between surface EC and root zone EC.