Figures
Figure 1 . Sampling locations in the present study (Geographic Coordinate System: GCS_WGS_1984).
Figure 2 . Average spectral signature of calibration and validation dataset of the salt-affected soils
Figure 3 . Soil salinity class-wise (a) raw reflectance spectra and (b) continuum-removed spectra
Figure 4 . Relationship between observed and predicted (a) soil pH, (b) electrical conductivity (EC), (c) Soil organic carbon (SOC), (d) Bulk density(BD), (e) Soil available nitrogen (N), (f) Soil available phosphorus (P), (g) Ammonium extractable potassium (K), (h) Ammonium extractable sodium (Na) (i) Ammonium extractable calcium (Ca), (j) Ammonium extractable magnesium (Mg), (k) Soil available sulphur (S), (l) Soil available iron (Fe), (m) Soil available manganese (Mn), (n) Soil available copper (Cu), (o) Soil available zinc (Zn), (p) Soil available boron (B); R2, coefficient of regression; MBE, Mean bias error; RMSE, Root mean square error; RPD, ratio of performance to deviation; SVR, Support vector regression; PLSR, Partial least square regression; PCR, Principal component regression; RF, Random forest; Multivariate adaptive regression splines MARS