Study on grain yield and gas exchange in different wheat (Triticum aestivum L.) cultivars influenced by applications of different sources of fertilizer under dryland farming

In order to investigate the effect of plant growth promoting rhizobacteria on grain yield and gas exchange of new dryland wheat cultivars, a factorial field experiment was counducted in a randomized complete block design with three replications on the farms of Sarablah Agricultural Research Center in the cropping seson during 2019-2020. Experimental treatments include different wheat cultivars (Sardari, Karim, Koohdasht and Rijo) and treatment of different fertilizer sources including: control (without fertilizer source), 50% N fertilizer, Azospirillum + 50% N fertilizer, Azetobacter + 50% N fertilizer, Azospirillum + Azetobacter + 50% N fertilizer and 100% N fertilizer. The results of this study showed that the interaction of cultivar×different fertilizer sources was significant on grain yield, yield components as well as gas exchanges of dryland wheat. the highest grains.spike-1 (80%), 1000-grain weight (33.3%), grain yield (86.3%), biological yield (79.9%), photosynthesis rate (81.8%), transpiration rate (74.8%), mesophilic conductance (85%), photosynthetic water use efficiency (42.3%) was obtained from the interaction of Rijo× Azospirillum+Azetobacter +50% N fertilizer and the lowest value of these traits was related to the interaction between Sardari cultivar control treatment (without fertilizer source).