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Germination ecology and response to herbicides of Ludwigia prostrata and their implication for weed control in paddy fields

Published online by Cambridge University Press:  19 May 2023

Tao Li
Affiliation:
Associate Professor, Shanghai Academy of Agricultural Sciences; Shanghai Engineering Research Centre of Low-carbon Agriculture; Key Laboratory of Low-carbon Green Agriculture in Southeastern China; Ministry of Agriculture and Rural Affairs, Shanghai, China
Huawei Qian
Affiliation:
Undergraduate student, University of California–Santa Cruz, Santa Cruz, CA, USA
Guohui Yuan
Affiliation:
Assistant Professor, Shanghai Academy of Agricultural Sciences, Shanghai, China
Jiequn Fan*
Affiliation:
Associate Professor, Shanghai Academy of Agricultural Sciences; Shanghai Engineering Research Centre of Low-carbon Agriculture; Key Laboratory of Low-carbon Green Agriculture in Southeastern China; Ministry of Agriculture and Rural Affairs, Shanghai, China
Shuiliang Guo*
Affiliation:
Professor, College of Life Sciences, Shanghai Normal University, Shanghai, China
*
Corresponding authors: Shuiliang Guo; Email: gsg@shnu.edu.cn; Jiequn Fan; Email: 18201791220@163.com
Corresponding authors: Shuiliang Guo; Email: gsg@shnu.edu.cn; Jiequn Fan; Email: 18201791220@163.com

Abstract

Prostrate water primrose is a troublesome weed in rice paddy fields. A study was conducted to determine the influence of environmental and agronomic factors on its emergence. The efficacy of herbicides on this species was also examined. The germination percentage of mature seeds remained above 90% within 180 d after harvest, indicating a low primary dormancy of this species. Light stimulated seed germination. Seeds buried deeper than 0.5 cm did not form seedlings. These results suggest that stale seedbed practices and deep tillage operations can mitigate the occurrence of this species in paddy fields. The optimum temperature for germination varied from 25/15 C to 35/25 C. The osmotic potential and salt concentration needed to inhibit 50% of maximum germination were −0.4 MPa and 197 mM, respectively. Seeds were tolerant to flooding and did not germinate at pH 8 to 10. The preemergence herbicides oxadiazon, oxadiargyl, and butachlor had excellent control efficacy on prostrate water primrose, with a 95.4% to 100% reduction in seedling number and a 99.2% to 100% reduction in biomass, respectively. The postemergence herbicides MCPA-Na + bentazone, bentazone, MCPA-Na, and fluroxypyr applied at the 2- to 3-leaf stage of prostrate water primrose provided a 90.6% to 100% reduction in seedling number and a 99.3% to 100% reduction in biomass. The results of this study can help in developing sustainable and effective integrated weed management strategies for controlling prostrate water primrose in paddy fields.

Type
Research Article
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Robert Nurse, Agriculture and Agri-Food Canada

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