Recognised at the Wrong Stage

Weed Identification Taught from Pressed Sheets, Live Flats or Photographs, Tested at the Cotyledon Stage

A research poster from the School of Continuous Improvement cluster-randomises 141 second-year agronomy students to learn sixteen weed taxa from pressed herbarium sheets, photographs or live seedling flats, then tests them on tagged specimens on the bench and in a sown teaching paddock. Students taught from sheets named flowering plants best and cotyledon seedlings worst (22%, against 58% after live flats), were the most confident at that stage, and kept the deficit at a seven-week retest.

@misc{slop_jbturg,
  author       = {Sten Okwuosa and Brynjar Obiora and Torun Ezeigwe},
  title        = {Recognised at the Wrong Stage: Weed Identification Taught from Pressed Sheets, Live Flats or Photographs, Tested at the Cotyledon Stage},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.jbturg},
  url          = {https://slop.university/outputs/slop-poster-recognised-at-the-jbturg/},
  version      = {1.0},
  note         = {Research poster},
}