What does the published scientific research say about Azotobacter paspali?

Azotobacter paspali — also known in the literature as Azorhizophilus paspali — appears in 4 indexed PubMed articles in a plant-input context. The peer-reviewed record positions it within biological nitrogen fixation (BNF) research rather than as a commercially characterized biostimulant product, so researchers and formulators searching for Azotobacter paspali nitrogen fixation or Azorhizophilus paspali biofertilizer will find a modest but established scientific footprint.

The clearest characterization comes from a Brazilian BNF history review (PMID 16127558), which identifies Azotobacter paspali as a rhizospheric diazotroph — distinct from associative and endophytic nitrogen-fixers — discovered through decades of field research coordinated by Johanna Döbereiner. Reported in peer-reviewed research, it is associated with graminaceous plants, and the review notes that plant genotype influences the plant-bacteria interaction, a detail relevant to anyone evaluating host range or strain selectivity for this species.