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DIVISION S-1—SOIL PHYSICS

Susceptibility to Compaction, Load Support Capacity, and Soil Compressibility of Hapludox

^a Universidad Nacional del Litoral, Facultad de Ciencias Agrarias, 86– Kreder 2805– S 3080 HOF, Esperanza (Sta Fe), Argentina
^b Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Depto. De Solos e Nutricão de Plantas, Av. Padua Dias 11, Caixa Postal 09, CEP: 13418-900, Piracicaba (SP), Brazil
^c Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON N1G 2W1, Canada

^* Corresponding author (apisilva{at}esalq.usp.br).

Models that integrate the influence of soil intrinsic attributes on the estimation of soil compaction are scarce for Hapludox. The present study tested the hypothesis that the compressive behavior of Hapludox with wide variations in intrinsic soil attributes can be estimated based on pedotransfer functions (PTFs). The general goal of this research was to determine the effect of intrinsic soil attributes on the susceptibility to compaction, preconsolidation pressure and compression curve of Hapludox, and to develop PTFs that allow the estimation of these parameters based on easily measurable soil attributes. The study was conducted on a soil toposequence that includes a sandy Typic Hapludox, a loamy Typic Hapludox, and a clayey Rhodic Hapludox. The uniaxial compression test was applied to 50 undisturbed soil samples at matric potential values of –10 and –100 kPa. After load withdrawal, soil bulk density, void ratio, gravimetric soil water content, particle-size distribution, particle density, and organic matter were determined. The compression curves, the compression index, and the preconsolidation pressure were obtained. The relationship between the compression index, soil bulk density, and clay content was statistically significant with R² = 0.77. Organic matter and soil water content did not affect the compression index. The preconsolidation pressure was significantly related with soil bulk density, soil water content, and clay content (R² = 0.70), but was unaffected by organic matter. Soil compressibility was dependent on soil bulk density. A nonlinear model fitted the data with R² = 0.90 allowing to predict the compressibility of soils for a wide range of stresses and inherent soil properties.

Abbreviations: PTF, pedotransfer function • VIF, variance inflation factor

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