Measuring Soil and Tissue Potassium with a Portable Ion-Specific Electrode in Cotton

Most laboratories make potassium (K) fertilizer recommendations based on field research calibrated with soil K from atomic absorption spectroscopy, flame emission spectroscopy, or inductively coupled plasma mass spectrometry. Information is needed to interpret readings from K + meters on cotton. The...

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Bibliographic Details
Published in:Communications in Soil Science and Plant Analysis 2016-10, Vol.47 (18), p.2148-2155
Main Authors: Stevens, Gene, Rhine, Matthew, Straatmann, Zach, Dunn, David
Format: Article
Language:English
Subjects:
Cardy
ion-specific electrode
Laqua
potassium meter
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Summary:Most laboratories make potassium (K) fertilizer recommendations based on field research calibrated with soil K from atomic absorption spectroscopy, flame emission spectroscopy, or inductively coupled plasma mass spectrometry. Information is needed to interpret readings from K + meters on cotton. The objective was to compare soil and cotton plant sap potassium content from a Laqua Twin™ K + meter to results from standard tests. Aluminum sulfate solution was used with the meter to extract K from 10 soil samples from the North America Proficiency Testing program. A linear relationship (R 2  = 0.86) was found between K measured with a K + meter and K measured with 138 labs using ammonium acetate or Mehlich-3. Using a factor of 1.4754 to adjust readings, fertilizer recommendations with the K + meter were similar to results from atomic absorption spectroscopy. A linear relationship was found between petiole K measured in the lab and petiole sap measured with the K + meter.
ISSN:0010-3624
1532-2416
1532-4133
DOI:10.1080/00103624.2016.1228944