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Open AccessArticle

Allelopathic Effects of Bidens pilosa L. var. radiata Sch. Bip. on the Tuber Sprouting and Seedling Growth of Cyperus rotundus L.

1
Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan
2
Taitung District Agricultural Research and Extension Station, Taitung 950, Taiwan
*
Author to whom correspondence should be addressed.
Plants 2020, 9(6), 742; https://doi.org/10.3390/plants9060742
Received: 24 April 2020 / Revised: 6 June 2020 / Accepted: 10 June 2020 / Published: 12 June 2020
(This article belongs to the Special Issue Weed Ecology and Management)
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. View Full-Text
Keywords: Bidens pilosa L. var. radiata Sch. Bip. (BPr); Cyperus rotundus L. (CR); allelopathy; weed control; interspecies competition; density-dependent phytotoxicity Bidens pilosa L. var. radiata Sch. Bip. (BPr); Cyperus rotundus L. (CR); allelopathy; weed control; interspecies competition; density-dependent phytotoxicity
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MDPI and ACS Style

Hsueh, M.-T.; Fan, C.; Chang, W.-L. Allelopathic Effects of Bidens pilosa L. var. radiata Sch. Bip. on the Tuber Sprouting and Seedling Growth of Cyperus rotundus L.. Plants 2020, 9, 742.

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