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Excerpts of photographs of corn root systems immerged in a container filled with water; only the root system appearing in a photograph is shown on a black background. The three corn seedlings grown for this illustration (variety 19K19 Blue River, same rooting medium, Hoagland nutrition solution) had reached stages of development comparable to those of Weeks 1–3 (from A–C) for the control corn seedlings in our experiment.
