الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
It is well known that, supplying crop plants with nitrogen plays an essential role in improving its productivity. Application of mineral nitrogen may be results in environmental pollution in addition to the high cost of such resource. In this respect, application of the inoculation with biofertilizers could be useful, increasing the high crop productivity and decreasing the environmental pollution as well as reduced the high cost of mineral fertilizers. Legume crops obtained sufficient nitrogen for growth and yield from the action of Rhizobium bacteria in root nodules; nevertheless, the highest seed yields of legume crops were resulted from the inoculation, which identified as biological N2-Fixation plus Chemical N-fertilizers. Biological N2-fixation (BNF) is a cheaper and environmentally friendlier source of nitrogen for plants, also led to the high productivity of the corps of legume plants. This biological process is identified as the conversion of atmospheric nitrogen to ammonia, a form of nitrogen (N) that can be utilized by plants. However, BNF is in the sole domation of certain bacteria (diazotrophs), which contain nitrogenase, the enzyme complex that catalyzes the conversion of N2 from the gaseous to the combined form (Hammam, 1995; Hamed, 1998; Fening & Danso, 2002; Sherif, 2003 and Vessey et al., 2004).