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<br />Some of the pertinent information conceming the field predictions contained in tables 5-7 <br />and figures 6a-8b is summarized below: <br /> <br />Field 1. The predicted median salinity levels were 5.56, 6.95, 7.95, and 8.12 dS/m in the <br />four sample depths. In the first depth (0-30 cm), about 48% of the field salinity <br />levels appear to be less than 5.5 dS/m. By the forth depth (90- 120 cm) it <br />appears that about 40% of the field salinity levels are greater than 8.5 dS/m. The <br />maps shown in figures 6a and 6b suggest that the soil salinity pattern is higher in <br />the southern half of the field, and appears to be the worst in the south-east comer. <br /> <br />Fields 2 & 3. The predicted median salinity levels were between 6.2 and 8.5 dS/m. However, <br />Figures 7a and 7b strongly suggest that the salinity levels were much higher in <br />field 2, as opposed to field 3. The worst salinity levels tend to occur in the <br />north-east section offield 2, where values above 12.0 dS/m appear to occur <br />at the deeper sample depths. Note that almost the entire area within field 3 <br />appears to be below 9.0 dS/m (across all four sampling depths). <br /> <br />Field 4. The predicted median salinity levels rose rapidly with depth in field 4. <br />Additionally, this field displays the most spatial salinity variability. Over 40% <br />of the field has salinity levels below 6.0 dS/m in the 0-30 em sampling depth. <br />By the 90-120 cm depth, almost 39% of the field appears to have salinity <br />levels greater than 12.0 dS/m. It should be noted that this field also displays <br />the most soil texture variability, as well as the highest SP/salinity correlation <br />(r=0.76, table 4). <br /> <br />Overall, the following observations are worth noting. The spatial salinity patterns in field <br />I are very "flat"; Le., there appears to be surprisingly little soil salinity variation across this field. <br />The levels that are out there are probably a result of the low quality irrigation waters. The salinity <br />pattern appears to abruptly change across the boundary between fields 2 and 3; this undoubtedly <br />has something to do with the management of these two fields. Finally, from a "mapping <br />perspective" the salinity patterns in field 4 are the most interesting (and spatial variable). <br />However, much of the spatial pattern may simply be due to localized soil texture variation. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />