Rhizobium engineering strain were obtained deriving from rhizobium and bacillus withantagonist to pathogens of soybean root rot and soybean cyst nematode were screened withinsoybean nodule, after study the system of both strains protoplast preparation, regeneration andamalgamation. The characters of this engineering strain were fixing nitrogen, promotinggrowth and antagonist to pathogens. Its fermentation conditions, action mechanism on fungiand plant parasite nematode, resistance induced were stu...