Fig. 3

The P concentration of each plant was determined after 14 days of treatment during the V2 stage. The bar chart shows the average total P accumulation (A), total P uptake efficiency (B) and ACP of roots (C) of two soybean germplasms under each treatment, with three replicates per treatment. Different letters above columns of the different color indicate statistic significant difference at P < 0.05 (Duncan’ s multiple range test). The * (P < 0.05) and ** (P < 0.01) indicate significant differences between bars of the same color (Student’s t-test). CK represents control, LP represents low phosphorus, S represents salt and LPS represents low phosphorus + salt