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Effects of wheat-legume co-cultivation on (a) medicarpin, (b) formononetin, and (c) genistein in legume root exudates (mean ± SE μg·g–1 DW). ML: monocropped legume, IL: intercropped legume. MEDSA: alfalfa, MEDPO: black medic, TRINC: crimson clover, and TRSUB: subterranean clover. Different letters (a,b) for each legume species indicate significant differences at the 0.05 level (Tukey’s post-hoc test). Error bars represent standard error (S.E.).
