ASSESSMENT OF SOME KRIGING METHODS FOR MAPPING THE SOIL ELECTRICAL CONDUCTIVITY: CASE STUDY OF SOUTH

This study looked at kriging methods for mapping soil electrical conductivity (EC) in Iran's southeastern coastal region. Longitude=47.975896177 Latitude=36.9953546224 and Longitude=48.209973627223 Latitude=37.241702530966 were the study area's coordinates, which spanned roughly 500 km2 of land area. 22.3 oC and 13 oC are the average maximum and lowest temperatures, respectively. Sampling points were chosen from seven (7) rows of 20 points each (where 4 points had been lost from the last row). To assess soil EC, soil samples were taken from 136 locations at depths ranging from 0 to 20 cm. Using ArcGIS software version 10.4.1 GS+ v 5.1 and SPSS v 16.1, soil EC maps depicting unique management zones due to EC results were constructed using ordinary kriging, universal kriging, log-normal kriging, and inverse distance weighting (IDW). The best reliable method for predicting and mapping soil EC was found to be log-normal kriging. The lowest soil salinity was found in the southeast, while the highest EC was found in the northwest of the study area, according to all four statistical methods. Agricultural activities involving soil tillage and soil drainage, which are far from the current seashore, also had the lowest soil EC.

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