Two field experiments were conducted during 2004 and 2005 seasons in the Research and Experimental Center of the Faculty of Agriculture at Moshtohor, Benha Univ. to study the response of two soybean cultivars to bacterial inoculation, mineral nitrogen and organic fertilization on yield and yield components. Two soybean cultivars (Giza 22 and Giza 111) were selected to five treatments which were the combination of mineral nitrogen fertilizer, farm yard manure (FYM) and inoculation with Rhizobia, i.e (Control, 40 Kg N/ fed, 20 Kg N/ fed + inoculation, 15 t FYM/fed, 7.5 t FYM/fed + inoculation).
The results could be summarized from the combined analyses of the two seasons as follows :
Giza22 soybean cultivar surpassed Giza 111 in pods weight/plant, seed weight/plant, 100 – seed weight, seed yield/fed and oil yield/fed .
Number of seeds/pod, pods weight/plant, seed weight/plant, 100-seed weight, oil percentage and seed, biological and oil yields/fed were significantly increased by N fertilization and manuring singly or combined with inoculation as compared with the control treatment .
There was a significant effect for the interaction between soybean cultivars and fertilization treatments on seed weight /plant only
Seed yield per feddan was high positively and significantly correlated with, weight of pods and seeds/plant and 100-seed weight of soybean.
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