ABSTRACT
Two field experiments were conducted at the Experimental Farm, Fac. of Agric. Moshtohor during the two successive seasons of 1999 and 2000 to study the effect of Bradyrhizobium japonicum and Bacillus megaterium var. phosphaticum inoculation in presence of micronutrients application (iron and molybdenum) on soybean nodulation, N2-ase activity, macro and micro-nutrients content in shoots, growth performance, yield and yield components of soybean plants. Obtained results show that soybean nodulation and N2-ase activity were increased with bradyrhizobial inoculated treatments. The highest records of soybean nodulation and N2-ase activity were observed in the treatment of dual inoculation with B. japonicum and B. megaterium var. phosphaticum combined with foliar application with iron and molybdenum. NH4-N, NO3-N, available-P and CO2 evolution were higher in the treatments inoculated with phosphate solubilizing bacteria and sprayed with either iron or molybdenum compared uninoculated ones. Soybean growth characters were significantly increased with either B. japonicum or B. megaterium var. phosphaticum inoculation compared to uninoculated treatments. The highly significant increase of soybean growth characters were observed in the treatment of dual inoculation combined with foliar application with molybdenum and iron. Also, obtained results indicate that macro and micro-nutrients content in shoots of soybean plants were the highest in case of dual inoculation and spraying with molybdenum and iron compared to spraying with either molybdenum or iron each one alone. Yield and yield components of soybean plants as well as protein and oil yield/ fed were significantly increased with either bradyrhizobial or phosphate solubilizing bacteria inoculation compared to uninoculated treatments. The highest records of yield, yield components, protein and oil yield were observed in the treatment of dual inoculation in combination with micronutrients foliar application.
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