Bidens pilosa L. var.
radiata Sch. Bip. (
BPr) had been found capable of excluding
Cyperus rotundus L. (
CR) from its vegetation in fallow fields. Both allelopathy and competition of
BPr were able to limit the growth of
CR,
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Bidens pilosa L. var.
radiata Sch. Bip. (
BPr) had been found capable of excluding
Cyperus rotundus L. (
CR) from its vegetation in fallow fields. Both allelopathy and competition of
BPr were able to limit the growth of
CR, but this has not been extensively investigated. To verify the two effects of
BPr on
CR management, density-dependent experiments and interspecies competitions with the application of activated carbon were conducted. The effects of
BPr soil and its residues on the reproduction of
CR were also evaluated. The results showed that the residues of
BPr reduced the growth (54–61% of control) and tuber number (58–71% of control) of
CR in the 3 plants pot
−1 treatment but not in higher density treatments. In the interspecies competition,
BPr exhibited an allelopathic but not competitive effect on
CR when activated carbon was absent.
CR tuber sprouting was significantly suppressed when sowed in the
BPr soil. Likewise,
BPr residue mulch inhibited the
CR plant density by 87% as compared to natural-occurring
CR residue mulch in the field. This study revealed that
BPr might have potential for use as a cover plant and allelopathic mulch to control
CR in the agroecosystem.
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