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This article in SSSAJ

  1. Vol. 30 No. 5, p. 553-558
     
    Received: Jan 28, 1966
    Published: Sept, 1966


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doi:10.2136/sssaj1966.03615995003000050010x

Infiltration and Redistribution of Water in Vertical Columns of Loam Soil1

  1. W. J. Staple2

Abstract

Abstract

A numerical method was used to compute infiltration and redistribution of water in vertical columns of air-dry Grenville silt loam. Hysteresis was taken into account in that drying tensions and hydraulic conductivities were interpolated from the appropriate scanning curves at each depth in the upper profile as redistribution continued into the dry soil below.

Although the computations were not confirmed by independent experiments, results from related measurements showed that the distribution curves were of the right magnitude. The moisture contents reached in the drying zone after 24 to 72 hours' redistribution were in agreement with field capacity data.

Computed moisture contents following redistribution in which hysteresis in both tension and conductivity were neglected differed considerably from the accepted hysteresis-dependent values. Computed moisture contents in which hysteresis in conductivities only were neglected were closer to the accepted values when conductivities for wetting were used.

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