Effects of plant growth-promoting rhizobacteria on co-inoculation with in soybean crop: a meta-analysis of studies from 1987 to 2018.

Background: The co-inoculation of soybean with and other plant growth-promoting rhizobacteria (PGPR) is considered a promising technology. However, there has been little quantitative analysis of the effects of this technique on yield variables. In this context, the present study aiming to provide a quantification of the effects of the co-inoculation of and PGPR on the soybean crop using a meta-analysis approach.