3.3.4 Electric conductivity (EC)
Figure 6 shows EC results in the six SUs for the three assessed depths.
In general, the soil in the study area had an EC of <2 μS
cm-1, classified as a non-saline soil (Hoorn &
Alphen, 1994). The natural vegetation, Ls and Ss had the lowest EC (108
μS/cm) compared to other SUs, whereas EC for Ds was slightly higher (185
μS cm-1). The agricultural crops had the highest EC
with average values of 321 and 231 μS cm-1 for Oc and
Pc, respectively. Fertilization could increase the concentration of
salts in the soil (Cortés, Pérez, & Camacho-Tamayo, 2013) and
consequently EC.
[Insert Figure 6]