Estimating Soil Solution Nitrate Concentration from Dielectric Spectra Using Partial Least Squares Analysis

Chighladze, Giorgi; Kaleita, Amy L.; Birrell, Stuart J.; Logsdon, S. D.

doi:10.2136/sssaj2011.0391

Cited by 9 publications

(7 citation statements)

References 45 publications

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“…This improves accuracy and also gives the sensor the ability to detect multiple ions. 2 2. The sensor has a built-in self-calibration system which makes them impervious to the variations in soil temperature and climatic conditions like hail, drought, rain etc.…”

Section: Introductionmentioning

confidence: 99%

A multi-frequency, self-calibrating, in-situ soil sensor with energy efficient wireless interface

Pandey¹,

Kumar²,

Weber³

2013

SPIE Proceedings

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Real time and accurate measurement of sub-surface soil moisture and nutrients is critical for agricultural and environmental studies. This paper presents a novel on-board solution for a robust, accurate and self-calibrating soil moisture and nutrient sensor with inbuilt wireless transmission and reception capability that makes it ideally suited to act as a node in a network spread over a large area. The sensor works on the principle of soil impedance measurement by comparing the amplitude and phase of signals incident on and reflected from the soil in proximity of the sensor. Accuracy of measurements is enhanced by considering a distributed transmission line model for the on-board connections. Presence of an inbuilt self-calibrating mechanism which operates on the standard short-open-load (SOL) technique makes the sensor independent of inaccuracies that may occur due to variations in temperature and surroundings. Moreover, to minimize errors, the parasitic impedances of the board are taken into account in the measurements. Measurements of both real and imaginary parts of soil impedance at multiple frequencies gives the sensor an ability to detect variations in ionic concentrations other than soil moisture content. A switch-controlled multiple power mode transmission and reception is provided to support highly energy efficient medium access control. 1

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Section: Introductionmentioning

confidence: 99%

A multi-frequency, self-calibrating, in-situ soil sensor with energy efficient wireless interface

Pandey¹,

Kumar²,

Weber³

2013

SPIE Proceedings

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show abstract

“…For high concentrations however, an analytical expression does not exist and the dynamics of the reaction depends on dissociation constant of the reactions. Since typical nitrate and chlorides concentration in soil is of the order 100 mgL −1 (Chighladze et al (2011)), we can assume approximate infinite dilution and hence above mentioned formula should hold true. More over, the ionic relaxation times increases with increase in size of ion (Santamarina et al (2001)).…”

Section: Resultsmentioning

confidence: 99%

“…The nitrate concentration values predicted from the TDR-measured bulk electrical conductivity and water content data were observed to correlate with the nitrate concentrations obtained by soil solution sampling method. In another study Chighladze et al (2011), the variation of soil permittivity and soil conductivity within the frequency range 200 Hz to 13 MHz is presented. It is shown that the TDR approach can be used to effectively detect nitrate concentration by measuring the soil permittivity and conductivity.…”

Section: Soil Moisture and Impedance Sensorsmentioning

confidence: 99%

“…The real part of soil permittivity is dominated by saline water concentration, whereas the imaginary part of the soil permittivity is governed by the concentration of free ions. According to Chighladze et al (2011)…”

Section: Crlh Patch Antenna/sensor-probementioning

confidence: 99%

“…The sensor has the capability to measure impedance at multiple frequencies. This improves accuracy and also gives the sensor the ability to detect multiple ions Chighladze et al (2011).…”

Section: Introductionmentioning

confidence: 99%

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Development of impedance spectroscopy based in-situ, self-calibrating, on-board wireless sensor with inbuilt metamaterial inspired small antenna for constituent detection in multi-phase mixtures like soil

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Modeling hillslope sediment yield using rainfall simulator field experiments and partial least squares regression: Cahaba River watershed, Alabama (USA)

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Estimating Soil Solution Nitrate Concentration from Dielectric Spectra Using Partial Least Squares Analysis

Cited by 9 publications

References 45 publications

A multi-frequency, self-calibrating, in-situ soil sensor with energy efficient wireless interface

A multi-frequency, self-calibrating, in-situ soil sensor with energy efficient wireless interface

Development of impedance spectroscopy based in-situ, self-calibrating, on-board wireless sensor with inbuilt metamaterial inspired small antenna for constituent detection in multi-phase mixtures like soil

Modeling hillslope sediment yield using rainfall simulator field experiments and partial least squares regression: Cahaba River watershed, Alabama (USA)

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