Results
The response of all microbial groups and plant measurements to increasing concentrations of glyphosate was consistent for both GR soybean varieties. Root colonization by Fusarium spp. increased in response to glyphosate applications and was further enhanced as soybean growth progressed. In contrast, the pseudomonad, Mn-reducing and IAA-producing microbial groups decreased in response to glyphosate regardless of GR soybean variety.Consistent with results for microbial groups, soybean root and shoot biomass also decreased with increasing glyphosate, indicating an influence of glyphosate on plant growth through its effect on rhizosphere microbial components.