Application of biofertilizers especially mycorrhiza is one of the most important methods for plant nutrition in ecological agriculture. In order to evaluate the effects of biofertilizers on growth characteristics and yield of black cumin (Nigella sativa L.) (dwarf variety), a field experiment was carried out based on randomized complete block design with four replications at the Agricultural Field of Shirvan College, Iran 2010-2011 growing season. Treatments included: mycorrhiza, phosphate solubilizing bacteria (PSB) and control. The results showed that the effect of phosphorus biofertilizers was significant (p<0.01) on black cumin growth characteristics, yield and yield components. Inoculation with mycorrhiza and PSB enhanced plant height 61 and 25% and decreased percentage of hollow capsules 78 and 61% compared with control, respectively. The highest biological yield seed observed in mycorrhiza (5.03 and 1.27 kg.m-2, respectively) and the lowest was for control (2.25 and 0.71 kg.m-2, respectively). This study showed that application of suitable biofertilizers could increase yield and yield components of black cumin.

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