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Development of a Multi-Channel Soil Macronutrient Detection System Using Ion-Selective Electrode

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121341194.(doi:10.13031/2013.42116)
Authors:   Linan Zhang, Miao Zhang, Mingya Sheng
Keywords:   Soil macronutrient, ion-selective electrode, multi-channel detection system, input impedance, temperature compensation

Soil macronutrient testing is the basis for nutrient recommendation and site-specific fertilization. The rapid response, inexpensive cost and low sample volume associated with ion-selective electrode (ISE) makes it an excellent detector for soil macronutrient detection. However, variations of soil temperature and pH would tremendously degrade the electrochemical performance of ISE through the change of ionic activity on both of the primary ion and the competitive ion. As far as we concerned, no effective electrochemical preventive measurement has been found yet.

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