Seed burial physical environment explains departures from regional hydrothermal model of giant ragweed (ambrosia trifida) seedling emergence in U.S. Midwest

Adam S. Davis, Sharon Clay, John Cardina, Anita Dille, Frank Forcella, John Lindquist, Christy Sprague

Research output: Contribution to journalArticlepeer-review

Abstract

Robust predictions of weed seedling emergence fro. The soil seedbank are needed to aid weed management. A common seed accession (Illinois) of giant ragweed was buried in replicate experimental gardens over 18 site years in Illinois, Michigan, Kansas, Nebraska, Ohio, and South Dakota to examin. The importance of site and climate variability by year on seedling emergence. In a nonlinear mixed-effects modeling approach, we used a flexible sigmoidal function (Weibull) to model giant ragweed cumulative seedling emergence in relation to hydrothermal time accumulated in each site-year. An iterative search method across a range of base temperature (Tb) and base and ceiling soil matric potentials (φb and φc) for accumulation of hydrothermal time identified optima (Tb = 4.4 C, φb = -2,500 kPa, φc = 0 kPa) that resulted in a parsimonious regional model. Deviations betwee. The fits for individual site-years an. The fixed effects regional model were characterized by a negative relationship between random effects fo. The shape parameter lrc (natural log of the rate constant, indicatin. The speed at which emergence progressed) and thermal time (base 10 C) durin. The seed burial period October through March (r = -0.51, P = 0.03). One possible implication of this result is that cold winter temperatures are required to break dormancy in giant ragweed seeds. By taking advantage of advances in statistical computing approaches, development of robust regional models now is possible for explaining arable weed seedling emergence progress across wide regions. Nomenclature: Giant ragweed, Ambrosia trifida L.

Original languageEnglish (US)
Pages (from-to)415-421
Number of pages7
JournalWeed Science
Volume61
Issue number3
DOIs
StatePublished - Jul 2013
Externally publishedYes

Keywords

  • Abiotic influences on seed dormancy
  • Hydrothermal time
  • Nonlinear mixed effects models
  • Regional environmental variation
  • Seedling recruitment phenology

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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