DETERMINATION OF YIELD STABILITY IN BREAD WHEAT GENOTYPES UNDER LOW INPUT IRRIGATION AND NITROGEN ENVIRONMENTS
With climate change in the world, changes in temperature and deficiency of irrigation water is considered as a serious threat affecting growth and crop production. Therefore, developing genotypes with existence stable high-yielding and high water use efficiency is a necessary. The purpose of this study was to detect the most yield adaptability/stability of eight bread wheat across 24 environments (combination of three irrigation regimes × four nitrogen levels × two seasons) based on AMMI and GGE methods. A randomized complete block designs with three replicates for each environment was used. AMMI analysis for, wheat grain yield exhibited the highly significant difference of genotypes, environment, GEI and first two interaction principal components (IPCA's). Based on AMMI stability value (ASV) and total rank (ASV and yield) discriminated genotypes Line 3 (G3), Line 1 (G1), Line 4 (G4) and Line 2 (G2) as the most stable and suited for water stress. Using GGE biplot facilitate comparison revealing Line 3 (G3) was the best and ideal genotype with high grain yield potential and stability. Generally, AMMI analysis and GGE biplot methods showed that genotypes Line 3 (G3) was detected to be the most adapted/stable under water deficiency. Thus they should be recommended for release with wider environmental adaptability in Egypt. Moreover, treatment 75 kg nitrogen with medium irrigation regime may be considered as alternative treatment for recommended high irrigation requirements and should be recommended for release with wider environmental adaptability in water deficiency of irrigation requirements.