To reduce nitrogen fertilizer consumption in corn cultivation, a research was done in complete randomized block design as split plot with three replications in 2008 in Al-Ashtar region. Nitrogen Factor was in four levels including the recommended amount based on soil test (control), 25, 50 and 75% recommended amount as the main factor and soil inoculation with bacteria (Azospirillum and Azotobacter) including no inoculation (control) and inoculation with 1, 2 and 3Kg ha bacteria with soil was as the sub-factor. The results showed that application of the treatments has significantly different effect on the performance of corn seed as consuming 2kg ha bacteria produced the highest grain yield of 11.35ton ha . The effect of nitrogen fertilizer on yield was significant and the highest performance was achieved in treatment of total consumption of nitrogen based on soil test (control) of 10.4 ton ha was achieved. In addition, nitrogen application base on soil test and in inoculation of soil with 2 kg ha bacteria produced the highest number of grains per row, total number of grains per corn , the weight to 1000-grain, harvest index is produced that make increase of seed/grain yield.
