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This article in SSSAJ

  1. Vol. 51 No. 6, p. 1575-1580
    Received: Dec 15, 1986

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Shrinkage Curve Indices to Quantify Cultivation Effects on Soil Structure of a Vertisol1

  1. D. McGarry and
  2. I. G. Daniells2



Differences in selected parameters and derived variables of models fitted to soil shrinkage curves were used to investigate soil structural degradation of an irrigated Pellustert in northern New South Wales, Australia. Significant differences between clods taken from the same depths in land prepared for cotton (Gossypium hirsutum L.) when “dry” and “wet” were found in specific clod volume at zero water content, the slope of the line in the normal shrinkage zone, the airfilled specific pore volume throughout normal shrinkage, and the range in water content in the structural shrinkage zone. These indicators showed that this soil prepared wet exhibited increased bulk density, decreased porosity, loss of structural pores, and tended to have weak structural development.

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