The dielectric properties of sandy soil for various moisture contents of distilled water and Urea-fluid solutions in soil are estimated in the lower frequency range from 20 Hz to 2 MHz using precision LCR meter. The spectra of complex permittivity e*(ω), loss tangent tan δ(ω), electrical conductivity σ*(ω), and complex impedance Z*(ω) plane plots of these soil-fluid system have been investigated for various moisture contents of different concentrations of Urea solution in the soil samples. The dielectric constant and dielectric loss of the soil increase with increase in moisture content of different concentrations of Urea solution in the soil. The dielectric constant and dielectric loss of the soil increases significantly with the decrease in frequency over the given frequency range. The complex impedance plane (Zʹ versus Zʺ) plot separates electrode polarization and bulk material phenomena, which can also be observed in the dielectric loss tangent peaks.

中文翻译：

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频率范围为20 Hz至2 MHz的尿素肥料混合土壤的介电性能

使用精密LCR测量仪，在20 Hz至2 MHz的较低频率范围内，估算了沙质土壤对蒸馏水中各种水分含量和尿素溶液的介电性能。研究了这些土壤-流体系统的复介电常数e *（ω），损耗角正切tanδ（ω），电导率σ*（ω）和复阻抗Z *（ω）平面图的光谱，了解各种水分含量土壤样品中不同浓度的尿素溶液 土壤中介电常数和介电损耗随不同浓度尿素溶液中水分含量的增加而增加。在给定的频率范围内，土壤的介电常数和介电损耗随频率的降低而显着增加。