Seed dressing with B. amyloliquefaciens FZB42 stimulates increased root production but reduced Pi uptake per root surface area in low Pi soils but not high Pi soils. A-B Total length of each root class per plant for three-week-old plants seed dressed at sowing with either B. amyloliquefaciens FZB42 or LB media as the untreated control and grown in either low Pi (A) or high Pi soil (B). C-D The total plant Pi content of the treatments in A and B, expressed as total Pi acquired after three weeks per root surface area. For A - D, n > 23 for each treatment, and *marks values significantly different from the untreated control values using Student’s t-test (p < 0.05). Error bars are standard errors of the mean (SEM).