Soil batches were initially leached to three levels of salinity and then packed in vertical and horizontal arrangements for laboratory experiments to study the effect of matrix nonuniformity on the apparent bulk soil electrical conductivity (ECa) measured by the four-electrode technique. Measured ECa of the nonuniform matrices deviated from those of a uniform soil by +260% to −50% depending on both differences in salinity levels of adjacent soils and their proximity to the measuring electrodes. Deviation is explained by dependence of electrical field distribution on soil matrix properties.