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. 2013 Dec 23;14(1):212–228. doi: 10.3390/s140100212

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 8. — Nitrate concentration in SW (top) and GW (bottom) in different fertilized rice plots from 30 March to 17 April. Nitrate concentration in zero-fertilized SW was under the detection limit of the sensor.