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Book: Field Soil Water Regime
Published by: Soil Science Society of America



  1.  p. 153-166
    SSSA Special Publication 5.
    Field Soil Water Regime

    R.R. Bruce (ed.)

    ISBN: 978-0-89118-900-8


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Oxygen Content in the Ground Water of Some North Carolina Aquults and Udults1

  1. R. B. Daniels,
  2. E. E. Gamble and
  3. S. W. Buol2


Measurement of oxygen content in Aquults and Udults indicates that the Aquults have reducing conditions (Fe2+ is stable) within 1 m of the surface that may last for months. The associated Udults have reducing conditions of short duration generally at depths of 2 m or more below the surface. However, many Udults are water saturated within 20 cm of the surface, but oxygen levels of the ground water remain high enough so that iron reduction does not take place. Aquults can be saturated to or above the soil surface for 4 to 5 months, yet the oxygen levels in the upper 0.5 m may remain high enough so that oxidizing conditions (Fe3+ is stable) exist. Thus water saturation does not always mean that reducing conditions prevail, even though organic rich A horizons are saturated.

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