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

 

This chapter in FIELD SOIL WATER REGIME

  1.  p. 37-55
    SSSA Special Publication 5.
    Field Soil Water Regime

    R.R. Bruce (ed.)

    ISBN: 978-0-89118-900-8

     

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doi:10.2136/sssaspecpub5.c3

Diurnal Changes in Soil Water Content During Drying1

  1. Ray D. Jackson2

Abstract

In the surface zone of a field soil, the soil water content exhibits a marked diurnal variation. The surface dries during the day and partially rewets at night. This variation plays a significant, but little understood role in the evaporation of water from soil. In two experiments, soil-water contents to 9 cm were measured in 1-cm increments at 0.5-hour intervals for 16 days during March 1971, and at 1-hour intervals for 7 days during July 1970. Diurnal soil water content changes, and soil water content and soil water flux profiles at several times are compared for the two seasons. The effect of the rate of drying on cumulative evaporation is discussed. The soil water regime under natural environmental conditions was so dynamic that the three stages of drying could not be delineated.

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Copyright © 1973. Copyright © 1973 by the Soil Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA