Agriculture Reference
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scenarios. It was noted that for all simulation scenarios, the soil salinity reached its
highest values in the middle of the flow domain (at the location of plant) followed by
the edges of the flow domains except in the case of 20 cm IPED with nonsaline irriga-
tion water. Therefore, APRDI with short IPED is recommended when using nonsaline
irrigation water. This will reduce the harmful effect of initially saline soil on seed
germination. Figure 6 shows also that the effect of using brackish irrigation water was
less pronounced in case of 20 cm as compared to 30 and 40 cm IPED, respectively.
Nevertheless, soil salinity levels at the middle of the flow domain in case of 20 cm
IPED with irrigation water salinity = 2 dS/m was approximately the same as in case of
30 cm IPED with nonsaline irrigation water. Therefore, the IPED has a great impact on
salinity values at soil surface especially at the location of plant trunk. Using brackish
irrigation water in case of long IPED increased significantly the soil salinity at the soil
surface especially at the location of plant trunk that may affect the seed germination.
Periodic leaching is necessary to remove the salt accumulated near the soil surface
when using brackish irrigation water especially for long IPED.
FIGURE 6
Soil salinity distribution along soil surface.
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