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Article
Rapid Nitrate Analysis of Soil Cores Using ISFETs
Transactions of the ASAE
  • Randy R. Price, Louisiana State University
  • John W. Hummel, United States Department of Agriculture
  • Stuart J. Birrell, Iowa State University
  • Irfan S. Ahmad, University of Illinois at Urbana-Champaign
Document Type
Article
Publication Version
Published Version
Publication Date
1-1-2003
DOI
10.13031/2013.13588
Abstract
An intact core extraction procedure was tested that might be used in the field for real–time prediction of soil nitrates. An extraction solution was pushed through a soil core held between two filters, and an ion–selective field–effect transistor/flow injection analysis (ISFET/FIA) system was used to sense soil nitrates in real time. Laboratory tests were conducted using four soil types and two levels of nitrate concentration, soil moisture, core density, core length, core diameter, and extraction solution flow rate. The extraction solution flow was sampled at the exit face of the core and routed to the ISFET/FIA system. The ISFET output voltage was sampled at 100 Hz. Results of the test indicate that nitrate extraction of the soil cores was successful, and that data descriptors based on response curve peak and slope of the ISFET nitrate response curve might be used in tandem in a real–time prediction system.
Comments

This article is from Transactions of the ASAE 46 (2003): 601–610, doi:10.13031/2013.13588.

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Open
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Citation Information
Randy R. Price, John W. Hummel, Stuart J. Birrell and Irfan S. Ahmad. "Rapid Nitrate Analysis of Soil Cores Using ISFETs" Transactions of the ASAE Vol. 46 Iss. 3 (2003) p. 601 - 610
Available at: http://works.bepress.com/stuart_birrell/24/