Quantity and quality yield of durum wheat under the impact of growth promoting bacteria in rain-fed and supplementary irrigation conditions

In order to investigate the effect of growth promoting bacteria on yield and yield components and some nutrients of durum wheat, an experiment was carried out at the research farm of Ilam University in 2015-2016. An experiment was carried out as a factorial based on a randomized complete block design with three replications. Experimental factors included three levels of growth stimulating bacteria (Azospirillum brasilense, Azotobacter chroococcum and non-inoculation), moisture conditions in two levels (supplementary irrigation and rainfed) and two durum wheat cultivars (Saji and Dehdasht). The results showed that supplementary irrigation increased yield and yield components and nutrients content of durum. The effect of Bio-fertilizer on yield and yield components and nutrients of durum wheat was significant but Azospirilum was superior to Azotobacter. Finally, the highest concentrations of nitrogen (20.71 %), phosphorus (13.1 %), potash (3.7 %), and maximum grain yield (2923 kg.ha-1), biological yield (8566 kg.ha-1) and harvest index (42.39 %) were obtained from two cultivars under irrigation conditions in inoculation with growth promoting bacteria.