Modeling and correction of soil penetration resistance for varying soil water content

Carlos M.P. Vaz, Juliana M. Manieri, Isabella C. de Maria, Markus Tuller

Research output: Contribution to journalArticlepeer-review

135 Scopus citations


For this study penetration resistance (PR) was measured within the profiles of four Oxisols for a wide range of water contents (θ) and bulk densities. Obtained data were utilized to parameterize 23 previously applied regression models. The most promising models were selected to illustrate effects of soil texture on PR. Finally, a new correction method based on normalization of PR with θ corresponding to a matric potential of - 10. kPa was introduced. Evaluation of texture effects revealed that for very wet soils PR was lowest, but increased with clay content. PR at - 1500. kPa exhibited a maximum at clay content of 35% and at - 10. kPa PR was least affected by texture. From all regression models three- and two-parametric exponential and power functions yielded closest matches to measured data. The proposed correction significantly dampened the influence of θ on PR, which allows better comparison for a specific soil or among different soils.

Original languageEnglish (US)
Pages (from-to)92-101
Number of pages10
Issue number1
StatePublished - Oct 30 2011


  • Bulk density
  • Matric potential
  • Penetrometer resistance
  • Regression equations
  • Soil compaction
  • Water content

ASJC Scopus subject areas

  • Soil Science


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