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This article in SSSAJ

  1. Vol. 28 No. 4, p. 457-460
     
    Received: June 12, 1963
    Accepted: Feb 20, 1964


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doi:10.2136/sssaj1964.03615995002800040004x

Penetration of Wax Layers by Cotton Roots as Affected by Some Soil Physical Conditions1

  1. H. R. Gardner and
  2. R. E. Danielson2

Abstract

Abstract

The use of a wax layer for root penetration tests under controlled soil conditions has made it possible to separate from other factors in the soil the effect of mechanical impedance on the growth of plant roots. The penetration percentage of cotton roots increased as soil moisture tension was increased from 0.05 bar to 0.52 bar then decreased as tension was further increased to 10.8 bars. The penetration also decreased with increasing salt content in the soil solution. Decreased aeration as measured by CO2 content also lowered the penetrating ability of cotton roots. An increase in bulk density of the soil from 1.0 g. per cc. to 1.4 g. per cc. did not affect the penetrating ability of cotton roots into the wax layer.

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