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

ABSTRACT

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.

¹ Contribution from CSIRO., Australia.

² Research Scientist, CSIRO, Div. of Soils, Cunningham Lab., 306 Carmody Road, St. Lucia, Queensland 4067, Australia; and Research Chemist, New South Wales Dep. of Agriculture, Agric. Res. Stn., Myall Vale, Narrabri, New South Wales 2360, Australia.

Received for publication December 15, 1986.