p. 1207−1219
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p. 1221−1232
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p. 1233−1246
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p. 1247−1268
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p. 1269−1283
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SAR <18.
With respect to the elemental nutrients of El-Salam Canal irrigation water, throughout the two seasons of growth, their concentrations were varied from 2.84 to 5.75 mg/l for N, from 0.80 to 1.49 mg/l for P, from 0.89 to 0.92 mg/l for Fe, from 0.28 to 1.80mg/l for Mn, from 0.56 to 0.97 mg/l for Zn and from 0.03 to 0.09 mg/l for Cu.
The annual variations were represented by the concentrations of 3.07 and 5.28 mg/l for N, 1.15, 1.04 mg/l for P, 0.95 and 0.91 mg/l for Fe, 1.32 and 0.55 mg/l for Mn, 0.73 and 0.83 mg/l for Zn, 0.06 and 0.06 mg/l for Cu at the season of 2011/2012 and the season of 2012/2013, respectively. Their seasonal variations showed that, at summer seasonof2011/2012 all the concentrations of N, Fe, Mn, and Cu (mg/l) increased than their corresponding values at winter season. On contrary trend, P and Zn showed decreasing in their concentrations (mg/l) at summer season than their at winter season. While data showed that the at summer season2012/2013, N, P, Fe, and Zn (mg/l) increased than at winter season. On contrary trend, Mn and Cu showed decreasing in their values (mg/l) at summer season than their values at winter season.
In general, contents of N and P were considered blow the critical limits. Contents of Fe, Mn and Zn (mg/l) were, also, below the maximum ranges.
Data showed that Pb concentration (mg/l) ranged between 1.38 & 1.35 (mg/l) at 2011/2012 and 1.72 & 1.44 (mg/l) at 2012/2013 during the summer and the winter seasons, respectively.
Cd-contents (mg/l) were ≈ 0.05 (mg/l), with non-effective differences were observed between Cd values either at winter or at summer for the two growth seasons of 2011/2012 and 2012/2013.
Generally, the investigated contents of Pb (mg/l) were below the recommended maximum ranges. While the obtained Cd values can be considered anomalous, and above the recommended maximum limit.]]>
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W2>W1 before planting. The same trend was observed after planting process but the mean values were higher than those before planting.
- Concerning grain yield, the mean values can be descended in order Misr-2 > Misr-1 > Sakha 94 > Sakha 93 of 452, 428, 413 and 366 (gm/Lyz.). The same trend was obtained for straw yield but the mean values are 1156, 1128, 1116 and 1013 (gm/Lyz.), respectively. Increasing the mean values of Misr-2 yields in comparison with other studied cultivars; it means that cultivar is more tolerant to the mixed and drainage water when use for irrigation than other cultivars.
- Regarding the effect of irrigation water quality, the highest mean values for grain and straw yields were recorded under W1 comparing with W2 and W3. Concerning, DTPA-extractable Pb, Cd, Ni, Mn, Zn and Cu, the highest mean values were recorded under W3 comparing with W1 and W2 before planting. The same trend was obtained after planting but the mean values were higher than those before planting.
- Straw content of the studied heavy metals were higher than that of corresponding grains for studied water quality treatments. Wheat straw and grain contents of Pb, Cd, Ni, Mn, Zn and Cu were higher under W3 in comparison with W1 and W2. The grains of wheat cultivar Misr-2 were the lowest in their contents of these heavy metals followed by those of Misr-1. The straw of Misr-2 had also the lowest content of Cd,Ni and Zn when drainage water was used for irrigation.
So, in conclusion, the study recommend planting the cultivar Misr-2 for irrigation with drainage water because it is the least affected by heavy metals and salinity.]]>
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