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This article in SSSAJ

  1. Vol. 44 No. 2, p. 433-435
     
    Received: Mar 19, 1979
    Accepted: Oct 19, 1979


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doi:10.2136/sssaj1980.03615995004400020048x

Summertime Flooding Effects on Alfalfa Mortality, Soil Oxygen Concentrations, and Matric Potential in a Silty Clay Loam Soil1

  1. B. D. Meek,
  2. T. J. Donovan and
  3. L. E. Graham2

Abstract

Abstract

Soil oxygen levels and soil water matric potentials were measured at the 15-, 30-, and 60-cm depths in plots subjected to flooding times of 15, 25, 35, and 45 hours. A decrease to 6% O2 or less in the soil for > 24 hours resulted in substantial losses of alfalfa (Medicago sativa L.). Soil O2 content decreased more at the 15-cm depth as compared with the 30- or 60-cm depths because of higher matric potential. The critical matric potential that restricted O2 movement was about −11 cbars.

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