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Abstract:A field trial was conducted in a private farm at AL-Hur region, holy Kerbala governorate -Iraq during [2015][2016] growing season. Six bread wheat cultivars were grown, namely lpa-99 AL-Rasheed, Abu-Ghraib-3, AL-Fateh, AL-Hussein and Bohooth-22 and irrigated with three water qualities: fresh river water, drainage water and alternate irrigation (fresh river water and drainage water). The design was Randomized Complete Block Design (R.C.B. D) with three replicates. The objective was to investigate the effect of different irrigation water qualities on some tolerance and susceptibly criteria of these cultivars. Stress susceptibly index (SSI), stress tolerance index (STI), tolerance of cultivars: (TOI), yield index (YI) and yield stability index (YSI) were studied. Results indicated that AL-Hussein cultivar gave the highest values of grain yield (680.00, 655.00 and 569.33 g m -2 ) under fresh river water, alternate water and drainage water compared with the lowest values of ALRashid cultivar (527.33, 511.00 and 374.66 g m -2 ), respectively. The reduction of grain yield (g m -2 ) of AL Hussein was the lowest 16.28% compared with 35.64, 34.64, 33.00, 29.00 and 24.99% for Bohooth-22, Abu-Ghraib -3, AL-Fateh, AL-Rasheed and lpa-99, respectively. This means that AL-Hussain cultivar was the most tolerant to the salinity of irrigation water where it possessed the highest value 1.196 of stress tolerant index (STI) and the lowest value 0.094 of stress susceptibility index (STI) compared with other cultivars. The drainage water gave the lowest values of grain yield 429.33g m -2 compared with 601.22 g m -2 in fresh river water and the alternate water was in between 556.00 g m -2 . It can be concluded, that a tolerant cultivar should be grown when salinized irrigation water is practiced.

Abstract:A field trial was conducted in a private farm at AL-Hilla, Iraq during the growing season 2014-2015. The objective of this study was to investigate the foliar application of ethephon and gibberellin on growth and yield of wheat (Triticum aestivum L.) cultivar Iba.99 planted in different dates. Results of this experiment revealed that: application of ethephon (GR 2 ) caused a significant increase in grain yield (an average) of 3.754 t ha -1 due to its superiority in one of the main components (number of spike.m ). However, gibberellin (GR 1 ) had significant increase in the weight of thousand grain (38.26 g). Planting date in November 18 (D3) significantly increased the grain yield to 5.25 tons. ha -1 due to high values of grain yield components. Most growth traits, were reflected in an increased biological yield. There was a significant interaction between planting dates and plant growth regulators (ethephon and gibberellin) in all traits, except spike length.