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This article in SSSAJ

  1. Vol. 33 No. 3, p. 445-448
     
    Received: Oct 14, 1968
    Published: May, 1969


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doi:10.2136/sssaj1969.03615995003300030031x

Soil Water Evaporation: Surface Residue Rate and Placement Effects1

  1. J. J. Bond and
  2. W. O. Willis2

Abstract

Abstract

Evaporation with time was measured from columns of originally wetted fine sandy loam soil subjected to uniform daily evaporative potential and treated with various rates of surface residue. During the initial constant rate drying stage, evaporation decreased with increasing residue rates. Conjunctively, the period of constant rate drying was appreciably lengthened with decreasing evaporation rates. After prolonged falling rate drying, cumulative evaporative losses were nearly equal irrespective of surface residue.

It was hypothesized that during falling rate drying and with limited quantities of residue, total evaporation might be less if the residue were placed on less than the entire soil surface in concentrated zones. Utilizing the available data, calculated curves were constructed which supported the hypothesis.

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