Irrigation water from King Abdullah Canal (KAC) was
used for soil leaching. Five pore volumes (PV) were
allowed to pass through soil columns and leachates were
collected in successive 30 mL aliquots. The PV is the
volume of water required to saturate all soil pores. Average
PV was about 460 mL, average porosity was 0.48, and flow
velocity ranged 2.2–2.4 cm h-1. The experiment was terminated
when salinity (EC) of effluent approached that of
canal water. Soil samples were taken out from columns,
dried and analyzed for EC, pH, exchangeable Na, Ca, Mg,
and K. Moreover, in separate column experiments a known
PV was added to each packed column (e.g. 1 PV), then the
leachate was collected once. After that soils were taken out
and analyzed for exchangeable Na and ECe. Data per each
percolated PV (exchangeable Na and ECe) were graphed
against PV.