Determination of water content and characteristic analysis in substrate root zone by electrical impedance spectroscopy

Wang, Yongqian; Zhao, Peng-Fei; Fan, Lifeng; Zhou, Qiao; Wang, Zi-Yang; Song, Chao; Chai, Zhi-Qiang; Yang, Yue; Huang, Lan; Wang, Zhongyi

doi:10.1016/j.compag.2018.11.037

Cited by 22 publications

(9 citation statements)

References 18 publications

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“…In these studies, the effect of the water saturation, which can be related to the VWC through the porosity, on the complex conductivity were investigated, and it was shown that the magnitude of complex conductivity, the in-phase conductivity, and even the quadrature conductivity follow power-law relations with the saturation [11][12][13][14][15]. Additionally, in some other works focusing on soil moisture measurements, the related electrical measurements were performed in wider frequency ranges of up to several MHz, and despite the presence of the effects of electrode polarization, the related results show good regular relations at different frequencies between the measured resistivity (or impedance, conductivity) and the water content [16][17][18]. In addition to the VWC, the dry density related to the porosity also has an effect on the soil conductivity; there are also some studies focusing on the effects of factors such as moisture and density on DC conductivity (or resistivity) of soils, where static compaction was used to control the density of the related samples [19,20].…”

Section: Introductionmentioning

confidence: 76%

Moisture–Conductivity Calibration for Electrical Imaging of Horticultural Substrate

et al. 2021

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Electrical imaging studies of laboratory- and small-scale plant root zones are gaining increasing attention. However, for essential moisture–conductivity calibrations on numerous substrate columns with variability in dry density, the use of one conventional strategy is relatively laborious or complicated. Thus, in this work, a relatively convenient calibration method is presented, and the objective is to identify its feasibility and potential to assess the effects of factors (e.g., volumetric water content (VWC), and dry density) on conductivity and establish necessary moisture–conductivity curves for porous materials (e.g., soils and substrates). In the method, with a specially designed fixture, variable VWCs, dry densities and related complex conductivities of the samples can be easily acquired through static compaction. The results show that the in-phase conductivity (or magnitude of conductivity) increases with the increasing VWC or dry density, primarily owing to the increase in the dominant pore water connectivity. Moreover, the effect of dry density on conductivity is relatively smaller than that of VWC. Thus, for the substrates at dry densities with certain variability, good power law relations (R2 ≥ 0.99) between in-phase conductivity (or magnitude of conductivity) and VWC at different frequencies can be established. Overall, the proposed approach is practical, promising, and relatively time- and labor-saving.

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Section: Introductionmentioning

confidence: 76%

Moisture–Conductivity Calibration for Electrical Imaging of Horticultural Substrate

et al. 2021

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“…Bio-impedance measurements are used in the diagnosis of plants behaviour to certain conditions such as fruit maturity 19,20 , fruit ripening 21,22 , analyzing the effect of heating and freezing conditions on fruits 23 , measuring of root growth 24 , and determining the water content and characteristic analysis of the root zone 25 . Also, it is used to provide information about environmental change effect on fruits 26 .…”

Section: Introductionmentioning

confidence: 99%

Plant Stem Tissue Modeling and Parameter Identification using Meta-heuristic Optimization Algorithms

Ghoneim¹,

Ismail²,

Said³

et al. 2021

Preprint

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Bio-impedance non-invasive measurement techniques usage is rapidly increasing in the agriculture industry. These measured impedance variations reflect tacit biochemical and biophysical changes of living and non-living tissues. Bio-impedance circuit modeling is an effective solution used in biology and medicine to fit the measured impedance. This paper proposes two new fractional-order bio-impedance plant stem models. These new models are compared among three commonly used bio-impedance fractional-order circuit models in plant modeling (Cole, Double Cole, FO Double-shell). The two proposed models represent the characterization of the biological cellular morphology of the plant stem through a non-invasive method. Experiments are conducted on two samples of three different medical plant species under the family Lamiaceae, and each sample is measured at two inter-electrode spacing distances. Bio-impedance measurements are done using an electrochemical station (SP150) in the frequency range from 100 Hz to 100 kHz. All employed models are compared by fitting the measured data to find the most suitable circuit model that models the plant stem. The proposed models give the best results in all inter-electrode spacing distances. Four different meta-heuristic optimization algorithms are used in the fitting process to extract all models parameter and find the best optimization algorithm in the bio-impedance problems.

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“…Recently, performance of electrical resistivity equipments has been improved by integrated circuits with multi-electrode channels to reduce the time for measurements [11][12][13]. Several researchers have reported the methodologies based on resistivity methods to measure electrical impedance: measurement of reinforced concrete specimens containing pre-corrosion and post-corrosion for health evaluation of structures [14], monitoring the crop root system using multi-frequency electrical impedance tomography [15], the determination of water content in substrate root with different water content [16], and measurement of an apparent resistivity ratio using two different frequencies to find aquifers [17]. Additionally, a new digital AC resistivity meter has been designed to measure resistivity at different frequencies.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Apparent Electrical Impedance of Soil with Water Flow Inside

Talapessy

Ikegami

Yoshida³

2020

Water

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Understanding the flow of groundwater is very important, not only for water management but also for the prevention and mitigation of natural disasters. The electrical resistivity method has been established as an effective groundwater exploration method in geological surveys. The purpose of this study is to develop an accurate investigation method for groundwater flow using soil impedance fluctuations. As a preliminary experiment, the apparent soil impedance was measured by applying a low-frequency current through a soil column with water flow inside. The apparent impedance showed fluctuations due to water flow at frequencies above 20 Hz, and the fluctuation range increased with the flow rate of water. It has been proposed that groundwater flow can be detected by measuring impedance fluctuations, and it is considered that this method can be applied to groundwater surveys and embankment and reservoir leak surveys.

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Determination of water content and characteristic analysis in substrate root zone by electrical impedance spectroscopy

Cited by 22 publications

References 18 publications

Moisture–Conductivity Calibration for Electrical Imaging of Horticultural Substrate

Moisture–Conductivity Calibration for Electrical Imaging of Horticultural Substrate

Plant Stem Tissue Modeling and Parameter Identification using Meta-heuristic Optimization Algorithms

Measurement of Apparent Electrical Impedance of Soil with Water Flow Inside

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