Application of biofertilizers, especially plant growth promoting rhizobacteria and Pseudomonas is one of the most important strategies for plant nutrition compared to chemical fertilizers, especially in sustainable management of agroecosystems [1]. In order to investigate the effect of biological fertilizers on the growth indices, yield and yield components of three sesame cultivars (Sesamum indicum L.) and evaluation effects of them on local mass and revised varieties (Kalat, Esfarayen and Oltan), an experiment conducted in the 2010-2011 in the form of split plots with randomized complete block design with three replications. Three cultivars of Sesam (Kalat, Esfarayen and oltan) allocated to the main plot and three biological fertilizers (nitroxin, phosphate solubizing bacteria, nitroxin + phosphate solubizing bacteria and control) allocated to sub plot. Parameters such as SPAD readings, leaf area index (LAI), Crop Growth Rate(CGR), Net Assimilate Rate (NAR), biological and economic yield, Oil content and yield, plant high, number of auxiliary branches, number of pods per plant, number of seeds per pod and 1000 seed weight were measured. Most of these parameters were not affected by the fertilizer treatments. However, there were significant differences between varieties. These results showed that biological fertilizers are effective on local mass, especially Esfarayen variety. Also nitroxin+biophosphor measured plant height observed with nitroxin application. In this experiment, sesame did not respond to biological fertilizers properly and this seems to be associated with the nature of this plant and the fertilizer soil conditions and the status of biological. Our results are consistent with other researcher’s reports [2,3].

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