Plant growth promoting rhizobacteria (PGPR) are a class of bacteria survived in the range of plant rhizosphere, which can secret plant hormone or inhibit pathogenic bacteria, Many studies showed that PGPR can promote nodulation, including increasing the number of nodules, promoting root development and so on. This paper reported that screening PGPR from soybean rhizosphere soil and the collection strains, selecting five combinations of PGPR and soybean rhizobium which improved nodulation and nitrogen fixati...