Analysis of an ion-selective electrode based methodology for integrated on-the-go mapping of soil pH, potassium, and nitrate contents

Balaji Sethuramasamyraja, Viacheslav I. Adamchuk, David B. Marx, Achim Dobermann, George E. Meyer, David D. Jones

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Knowledge of the spatial variation of soil attributes is critical for precision agriculture. On-the-go soil sensors have been able to provide relatively high mapping density while assessing this variation. A new ion-selective electrode (ISE) based approach was developed and tested for simultaneous mapping of soil pH, residual nitrate (NO3-), and soluble potassium (K+) contents. In this article, results of laboratory experiments investigating the effects of key measurement factors on ISE performance are presented. In addition to four different soils, these factors included: soil/water ratio (SWR), quality of water used for electrode rinsing (QWR) and for ion extraction (QWE), presence of ionic strength adjuster (ISA), and solution agitation (stirring). After the targeted ion activity presented by different soils, SWR was the second most influential factor causing increased measurement variance, while the influence of QWE was only significant for pH measurements. Based on this study, the following measurement parameters were recommended: agitated purified water extraction without ISA, addition of a fixed amount of water (preferably 1:1 soil/water ratio), and use of regular (tap) water for electrode rinsing.

Original languageEnglish (US)
Pages (from-to)1927-1935
Number of pages9
JournalTransactions of the ASABE
Volume50
Issue number6
StatePublished - Nov 1 2007
Externally publishedYes

Keywords

  • Ion-selective electrodes
  • Nitrate
  • On-the-go soil sensors
  • Potassium
  • Precision agriculture
  • Soil pH

ASJC Scopus subject areas

  • Forestry
  • Food Science
  • Biomedical Engineering
  • Agronomy and Crop Science
  • Soil Science

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  • Cite this

    Sethuramasamyraja, B., Adamchuk, V. I., Marx, D. B., Dobermann, A., Meyer, G. E., & Jones, D. D. (2007). Analysis of an ion-selective electrode based methodology for integrated on-the-go mapping of soil pH, potassium, and nitrate contents. Transactions of the ASABE, 50(6), 1927-1935.