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Mobile Laser-Induced Breakdown Spectroscopy for Future Application in Precision Agriculture-A Case Study.

Alexander Erler1, Daniel Riebe1, Toralf Beitz1

  • 1Physical Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.

Sensors (Basel, Switzerland)
|August 26, 2023
PubMed
Summary
This summary is machine-generated.

Laser-induced breakdown spectroscopy (LIBS) accurately estimates soil nutrients and properties for precision agriculture. Field-deployable LIBS instruments show promise for in-field soil analysis, enabling targeted fertilization strategies.

Keywords:
LIBSfeature selectionmultivariate methodsprecision agriculturesoil

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Area of Science:

  • Agricultural Science
  • Analytical Chemistry
  • Geoscience

Background:

  • Precision agriculture relies on accurate soil parameter estimation for targeted interventions like site-specific fertilization.
  • Laser-induced breakdown spectroscopy (LIBS) offers a potential method for rapid, in-situ soil analysis.

Purpose of the Study:

  • To evaluate the efficacy of LIBS for determining various soil parameters, including macro- and micronutrients, soil organic matter, and texture.
  • To compare the performance of handheld and platform LIBS spectrometers against a lab-based instrument for in-field applicability.

Main Methods:

  • Investigated 68 soil samples using handheld, platform, and lab-based LIBS instruments.
  • Applied multivariate statistical methods, including feature selection and regression techniques (PLS, PCR, SVM, Lasso, Gaussian processes), for soil parameter prediction.
  • Compared LIBS results with laboratory analysis for validation.

Main Results:

  • Excellent prediction accuracy was achieved for potassium (K), iron (Fe), and clay content.
  • Good prediction accuracy was observed for calcium (Ca), magnesium (Mg), phosphorus (P), manganese (Mn), copper (Cu), and silt content.
  • Field-deployable LIBS instruments provided reliable results comparable to the high-resolution lab spectrometer, indicating potential for in-field application.

Conclusions:

  • LIBS is a viable technique for the rapid, in-situ estimation of essential soil parameters in precision agriculture.
  • The successful transfer of LIBS methodology to field measurements facilitates targeted nutrient management and optimized fertilization strategies.
  • This study demonstrates the potential of LIBS for enhancing soil analysis efficiency and supporting sustainable agricultural practices.