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Background and aims <p>Flooding may promote the recruitment of hydrophytic weed species in cultivated lowland fields in temperate regions. This study tested whether different flooding regimes affect the magnitude and timing of <i>Echinochloa colona</i> seedling emergence.</p> Methods <p>We did a series of three annual crop-free experiments in mesocosms taken from agricultural wetlands located in the Pampas region to test if <i>Echinochloa colona</i> (L.) Link. seedling emergence, aboveground biomass and seed production per area could be affected by flood regimes differing in duration and timing.</p> Results <p>Flooding or intermittently flooding-drawdown conditions during the growing season did not increase total emergence compared to drained controls at field capacity; however, flooding affected the seedling emergence pattern by skewing emergence peaks towards mid-summer. Notably, abundant subaquatic <i>E. colona</i> seedling emergence was observed in spring (≈ 2500 seedlings m<sup>−2</sup>) in constantly flooded mesocosms. In the second experiment we found that even after prolonged and frequent flood pulses that decreased seedling emergence, <i>E. colona</i> seed production was enough to replenish the soil bank. In a third experiment we revealed that a long winter flooding, before the growing season, decreased total seedling cumulative emergence yet did not change the emergence pattern of seedlings.</p> Conclusion <p>The extended temporal window of <i>E. colona</i> recruitment due to flooding can complicate its field control and should be included in weed emergence models to accurately forecast <i>E. colona</i> seedling recruitment to advise weed control and management decisions.</p>

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Flooding during the growing season does not promote Echinochloa colona seedling emergence but shifts cohorts to summer drawdown periods

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Juliana Echeverry Holguín,
  • Gustavo G. Striker,
  • María Crepy,
  • Federico P. O. Mollard

摘要

Background and aims

Flooding may promote the recruitment of hydrophytic weed species in cultivated lowland fields in temperate regions. This study tested whether different flooding regimes affect the magnitude and timing of Echinochloa colona seedling emergence.

Methods

We did a series of three annual crop-free experiments in mesocosms taken from agricultural wetlands located in the Pampas region to test if Echinochloa colona (L.) Link. seedling emergence, aboveground biomass and seed production per area could be affected by flood regimes differing in duration and timing.

Results

Flooding or intermittently flooding-drawdown conditions during the growing season did not increase total emergence compared to drained controls at field capacity; however, flooding affected the seedling emergence pattern by skewing emergence peaks towards mid-summer. Notably, abundant subaquatic E. colona seedling emergence was observed in spring (≈ 2500 seedlings m−2) in constantly flooded mesocosms. In the second experiment we found that even after prolonged and frequent flood pulses that decreased seedling emergence, E. colona seed production was enough to replenish the soil bank. In a third experiment we revealed that a long winter flooding, before the growing season, decreased total seedling cumulative emergence yet did not change the emergence pattern of seedlings.

Conclusion

The extended temporal window of E. colona recruitment due to flooding can complicate its field control and should be included in weed emergence models to accurately forecast E. colona seedling recruitment to advise weed control and management decisions.