In order to evaluate the drought tolerance and susceptibility of six maize hybrids under water deficit conditions, an investigation was conducted during the growing season of 2016 at the Qlyasan Research station-University of Sulaimani. The field experiment was implemented according to the split plot design with three replications, four different irrigation levels were allocated in main plots, while six maize (Zea mays L.) hybrids were cultivated in the sub-plots. The yield response factor (Ky) was estimated through calculating adjusted crop coefficient (Ks) as well as adjusted Crop evapotranspiration (ETc adj.) in growth stages, including initial, rapid growth, mid-season, and the late season, revealing Ks values lower than that obtained by FAO paper No.33, (0.49, 0.6, 0.528, and 0.204) respectively. Four stress tolerance indices, including stress tolerance index (STI), stress tolerance (TOL), mean productivity (MP),) and geometric mean productivity (GMP) were used in this study. Data analysis demonstrated that the indices STI, TOL, MP, and GMP were more effective in defining the high yielding hybrids under different growing conditions. The results of the cluster analysis, yield response factor (Ky) and stress indices corresponded due to tolerance and susceptibility of maize hybrids.
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