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Conception d'un système d'analyse multi-capteur ISFET pour la surveillance in-situ de l'azote minéral. Application à la culture du blé dur

Abstract : Excessive use of nitrogen fertilizers in modern agricultural practices is a concern as it leads to groundwater pollution and eutrophication of fresh and marine waters. Soil testing can enable the introduction of new agricultural practices that take more into account temporal and local variations of soil and plants. This work therefore aims at the development of an in situ, autonomous and communicating analysis system for real-time monitoring of the mineral nitrogen contents of soils.Our system is based on the Ion-sensitive Field Effect Transistor (ISFET) microsensor technology. A first step of its development was dedicated to the fabrication of generic pH-ISFET microsensors. The problem of determining soil pH by inserting pH-ISFETs directly into the soil was considered. Results obtained by this in situ method were compared with the standard method and we examined the influence of soil ( moisture, texture, pH) and IFSET parameters (lifetime, time drift). In a second step, pNH4-ISFET and pNO3-ISFET chips were obtained by functionalizing the generic pH-ISFET chips with ionosensitive membrane. The composition of these membranes has been optimized until detection properties ( sensitivity, selectivity, stability, etc.) were in good accordance with the ammonium and nitrate ion contents of cultivated soils. Characterizations under in situ conditions were then carried out.Finally, the integration in the ground, the protection, the power supply and the remote communication of the sensors were made possible by the integration in a dedicated system. We obtained promising results.
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https://hal.laas.fr/tel-02918087
Contributor : Laas Hal-Laas <>
Submitted on : Thursday, May 23, 2019 - 10:05:35 AM
Last modification on : Thursday, June 10, 2021 - 3:05:38 AM

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  • HAL Id : tel-02918087, version 2

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Matthieu Joly. Conception d'un système d'analyse multi-capteur ISFET pour la surveillance in-situ de l'azote minéral. Application à la culture du blé dur. Electronique. INSA de Toulouse, 2018. Français. ⟨NNT : 2018ISAT0043⟩. ⟨tel-02918087v2⟩

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