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Assessing the Potential for Ion Selective Electrodes and Dual Wavelength UV Spectroscopy as a Rapid on-Farm Measurement of Soil Nitrate Concentration

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Author(s): Rory Shaw | A. Prysor Williams | Anthony Miller | Davey L. Jones

Journal: Agriculture (Basel)
ISSN 2077-0472

Volume: 3;
Issue: 3;
Start page: 327;
Date: 2013;
Original page

Keywords: crop nutrients | fertiliser management | nitrogen use efficiency | soil analysis

ABSTRACT
Current fertiliser recommendations for nitrogen are limited in their accuracy and may be improved by the use of simple on-farm soil rapid tests. This paper investigates the potential for using nitrate (NO3−) ion selective electrodes (ISEs) and dual wavelength UV spectroscopy as part of a rapid soil NO3− diagnostic test. Three soil types, representing the major soil types for agriculture in the western UK, were tested. For the three soils, the ISE rapid test procedure gave a near 1:1 response (r2 = 0.978, 0.968, 0.989) compared to the internationally-approved standard laboratory method. However, the accuracy of the ISE rapid test was reduced at low soil NO3− concentrations (
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