DOI: 10.36347/sjavs.2018.v05i07.005

Pages: 405-409

Abstract: The experiment was conducted during two consecutive seasons of 2013/2014 and 2014/2015 at high terrace soil, Dongola Rsearch Station Farm. Dongola, Northern State, Sudan. The objective of this study was to determine the efficiency of yield based tolerance indices on two cultivars of wheat in high terrace soil of Sudan. Experimental design used was randomized complete block in split-split plot arrangement with three replications. The main plot was consisted of three water intervals (7, 14 and 21days) and the subplots were consisted of two varieties (Wadi- El neil and ELneileen), while Sub-sub plot consisted of four nitrogen levels ( zero, 43, 86 and 129 kg N/ha). Several yield based drought tolerance indices including stress tolerance indices (STI), Stress sustainability indices (SSI) and tolerance indices (TOI) were calculated. The results showed that there were no significant differences between nitrogen levels, wheat varieties and their interactions on tolerant indices and stress stability indices in both seasons. The variety Wadi ELneil performed better in most of yield and yield based tolerance indices than Elneileen. The analysis of variance revealed that there were highly significant differences among nitrogen levels on stress tolerance index in both seasons. The application of 129 kg N/ha gave greater stress tolerance index in both seasons .There were significant differences among wheat varieties in stress tolerance index in the second season only and no differences among interaction of nitrogen and cultivars. The results indicated that nitrogen dose of 129 kg/ha increased significantly yield of wheat, but in some economically cause the use of 86 kg/ha is more suitable. Irrigation interval at seven days gave greater yield in comparison of irrigation intervals after 14 and 21 days. Nitrogen use efficiency is more reliable character in the use of fertilizer doses in high terraces soil in the Northern State of Sudan.