In land evaluation, soil salinity is a limiting factor of plant growth in most suitable land systems. In order to prepare map salinity of south Qazvin Plain with sampling topsoil sample of 0 to 30 cm, electrical conductivity (EC), clay and pH of soil samples were measured. Finally, to provide the salinity map of topsoil, the accuracy of the several common methods of interpolation including Kriging, CoKriging, Spline, and Inverse Distance Weighted was evaluated. The results showed that Co-Kriging method by using auxiliary variable like clay had the lowest mean absolute error (MAE) (0.5) and root mean square error (RMSE) (108) compared to the other methods.
Key words: Kriging, salinity, interpolation, Qazvin Plain.
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