الفهرس 
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Abstract
A field trial was conducted at Al-Gemmeiza Agriculture Research Station (Middle Delta, EL-Gharbia Governorate, Egypt), during summer seasons of 2010 and 2011. To study the effect of three phosphorus fertilization sources at the rate of 30 % P2O5 i. e., rock phosphate (RP) 6.25 total P2O5, superphosphate (SP) 15.0% water soluble P2O5 and without phosphate fertilizer, with phosphorus dissolving bacteria (Bacillus Megatherium Var-phosphaticum) and/or fungi (Mycorrhiza) and without inoculation under foliar application of organic acids (humic and fulvic) or without foliar spray on soybean plant variety Giza 22. The experiment was arranged in a split- split plot design.
The main treatments were applied as P in the three forms, while, the sub-treatments were applied as P inoculation in the four forms, and the sub sub-treatments were applied as foliar application of organic acids.
The results can be summarized as follow:
The obtained results reveal that in most cases, the treatment of rock (RP) and superphosphate (SP) gave the best significant values of most parameters compared without P addition in both seasons.
Generally, inoculation of mixed bacteria+ fungi application led to significant increase of soybean seed, straw , biological yield kg/fed ,as well as, N, P and K uptake of seed, straw and biological yield. In addition to protein%, oil% and oil yield kg/fed., in both seasons.
The interaction effect between P sources and inoculation by microorganisms on most parameter, phosphate fertilizer sources with inoculation of bacteria alone or mixed with fungi were the best ones among all studied manures during both seasons.
In most parameters foliar spray of organic acids application weren’t affected significantly by foliar spray of (humic + fulvic acids) in both seasons. Except in some qualities improved significantly by foliar spray application of organic acids i.e. available P of soil after soybean harvesting in both seasons and pods weight/plant in first season, also, seed yield kg/fed. or protein% or oil yield kg/fed. in second season.
In most parameters, the interaction effect between P sources and foliar spray of organic acids show that increased significantly by treatment of P sources i.e. rock or superphosphate with foliar spray of organic acids in both seasons.
As general, the combined treatments of all inoculation with foliar spray of humic+ fulvic acids positive effect on most yield attributes under study during the two growing seasons.
Keywords: Phosphorus sources, Rock phosphate, Superphosphate, Inoculation, Organic acids, Humic and fulvic acids, Soybean