Evaluation of an on-the-go technology for soil pH mapping

Viacheslav I. Adamchuk, Eric D. Lund, Todd M. Reed, Richard B. Ferguson

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Since conventional sampling and laboratory soil analysis do not provide a cost effective capability for obtaining geo-referenced measurements with adequate frequency, different on-the-go sensing techniques have been attempted. One such recently commercialized sensing system combines mapping of soil electrical conductivity and pH. The concept of direct measurement of soil pH has allowed for a substantial increase in measurement density. In this publication, soil pH maps, developed using on-the-go technology and obtained for eight production fields in six US states, were compared with corresponding maps derived from grid sampling. It was shown that with certain field conditions, on-the-go mapping can significantly increase the accuracy of soil pH maps and therefore increase the potential profitability of variable rate liming. However, in many instances, these on-the-go measurements need to be calibrated to account for a field-specific bias. After calibration, the overall error estimate for soil pH maps produced using on-the-go measurements was less than 0.3 pH, while non-calibrated on-the-go and conventional field average and grid-sampling maps produced errors greater than 0.4 pH.

Original languageEnglish (US)
Pages (from-to)139-149
Number of pages11
JournalPrecision Agriculture
Volume8
Issue number3
DOIs
StatePublished - Jun 2007

Keywords

  • Ion-selective electrode
  • On-the-go mapping
  • Soil pH

ASJC Scopus subject areas

  • General Agricultural and Biological Sciences

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