Partial replacement of chemical fertilizer by compound microbial inoculant and potential for promoting growth of intercropped Zea mays and Pisum sativum Assessment of rhizobacteria strains for Vicia sativa The inoculant potential of plant growth promoting rhizobacteria strains to improve the yield and quality of Trifolium pratense cv. Minshan Effects of bio-fertilizers with different PGPR strain combinations on yield and quality of alfalfa Research progress on PGPR/AMF interactions Factors affecting colonization of introduced microorganisms on plant roots Analysis of plant growth promoting rhizobacteria population in apple rhizosphere soils Effects of PGPR Inoculum without Exogenous Nitrogen on the Growth and Root System Characteristics of Vicia sativa L. Effects and mechanisms of interactions between arbuscular mycorrrhizal fungi and plant growth promoting rhizobacteria