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Schematic figure of the timing of sample collection from bulk soil and soybean rhizosphere soil for all crop sequences. Bulk soil and rhizosphere soil samples were collected at a depth of 0–20 cm. (A) Soil was collected from bulk soil using a soil probe before seeding soybean. Sampling of bulk soil in the inter-row area between soybean plants and rhizosphere soil of soybean at the (B) V6 and (C) R1 growth stages.
