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2.22>0.23>0.16 respectively. In the deepest layers the contents were 0.29>0..05> 0.00=0.00, respectively.]]>
p. 387−392
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p. 393−401
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p. 403−410
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Pb> Cd according to NAS/NAE, (1972) (National Academy of Sciences / National Academy of Engineering) and FAO (1985). The results indicated that heavy metals contents were within the permissible limits for irrigation in most sites for lead (Pb) except for water samples No. 7, they were in the maximum limits (more than 5 ppm), While cadmium and nickel values were within the maximum limits for irrigation in water samples except water samples (No. 1 and 3 in winter and summer and No. 5 in winter). The obtained data showed that Ni values were within the maximum limits for irrigation except water samples (No. 1 , 3 and 5 in winter and summer) . In general, the EC ,SAR, NO3 –N , NH4-N , COD , BOD , heavy metals (Pb, Ni and Cd) values at the beginning of the drains were lower than at the end of the drains in the studied area in the three drains . The evaluation of drains are ranged from slightly to moderately suitable for all studied parameters except the two heavy metals (Ni and Cd). So, to use this water for irrigation, good management for salinity control and suitable species of plants must be considered.]]>
p. 411−417
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p. 419−426
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p. 427−432
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p. 433−437
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