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Abstract <p>The results of measuring the contents of clay and humus and complex permittivity in 23 soil samples in the frequency range of 10 kHz to 8–10 GHz at different moisture are presented. The content of physical clay (particles of &lt;0.01 mm) in the samples varied from 1.7 to 47.5%; the humus content, from 0.7 to 8%. The study of dielectric relaxation processes made it possible to find correlations between the process parameters and the clay content. The strength of low-frequency relaxation and the complex permittivity at a frequency of 100 kHz measured in a state close to complete capillary saturation were used to estimate the clay content. The squared correlation coefficient between the found mean values and those measured by sedimentation technique was 0.89; the mean deviation was 14%, and the maximum deviation for two soil samples reached 50–60%. The humus content was estimated from data on the physical clay content, and the maximum amount of bound water was determined by the dielectric method—via modeling dielectric spectra using the relaxation–refraction model as the mean of the values for different moisture of soil samples. The squared correlation coefficient for the found values and those measured using the Walkley–Black method amounted to 0.72; the mean deviation, to 28% with a maximum deviation of 200% for only one soil sample. The causes of high errors are discussed.</p>

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Assessment of the Clay and Humus Contents in Soils Using the Dielectric Method

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • P. P. Bobrov,
  • T. A. Belyaeva,
  • E. S. Kroshka,
  • O. V. Rodionova

摘要

Abstract

The results of measuring the contents of clay and humus and complex permittivity in 23 soil samples in the frequency range of 10 kHz to 8–10 GHz at different moisture are presented. The content of physical clay (particles of <0.01 mm) in the samples varied from 1.7 to 47.5%; the humus content, from 0.7 to 8%. The study of dielectric relaxation processes made it possible to find correlations between the process parameters and the clay content. The strength of low-frequency relaxation and the complex permittivity at a frequency of 100 kHz measured in a state close to complete capillary saturation were used to estimate the clay content. The squared correlation coefficient between the found mean values and those measured by sedimentation technique was 0.89; the mean deviation was 14%, and the maximum deviation for two soil samples reached 50–60%. The humus content was estimated from data on the physical clay content, and the maximum amount of bound water was determined by the dielectric method—via modeling dielectric spectra using the relaxation–refraction model as the mean of the values for different moisture of soil samples. The squared correlation coefficient for the found values and those measured using the Walkley–Black method amounted to 0.72; the mean deviation, to 28% with a maximum deviation of 200% for only one soil sample. The causes of high errors are discussed.