Practical improvements of soil redox potential (Eh) measurement for characterisation of soil properties. Application for comparison of conventional and conservation agriculture cropping systems
2016
Husson, Olivier | Husson, Benoit | Brunet, Alexandre | Babre, Daniel | Alary, Karine | Sarthou, Jean-Pierre, J.-P. | Charpentier, Hubert | Durand, Michel | Benada, Jaroslav | Henry, Marc | Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | IDEE AQUACULTURE ; Partenaires INRAE | AGroécologie, Innovations, teRritoires (AGIR) ; Institut National de la Recherche Agronomique (INRA)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT)-Université de Toulouse (UT) | Société Civile d'Exploitation Agricole ; Partenaires INRAE | Le Cazal ; Partenaires INRAE | Agrotest Fyto Ltd | Université de Strasbourg (UNISTRA)
International audience
Show more [+] Less [-]English. The soil redox potential (Eh) can provide essential information to characterise soil conditions. In practice, however, numerous problems may arise regarding: (i) Eh determination in soils, especially aerobic soils, e.g. variations in the instrumentation and methodology for Eh measurement, high spatial and temporal Eh variability in soils, irreversibility of the redox reaction at the surface electrode, chemical disequilib- rium; and (ii) measurement interpretation. This study aimed at developing a standardised method for redox potential measurement in soils, in order to use Eh as a soil quality indicator. This paper presents practical improvements in soil Eh measurement, especially regarding the control of electromagnetic perturbations, electrode choice and preparation, soil sample preparation (drying procedure) and soil:water extraction rate. The repeatability and reproducibility of the measurement method developed are highlighted. The use of Eh corrected at pH7, peþpH or rH2, which are equivalent notions, is proposed to facilitate interpretation of the results. The application of this Eh measurement method allows characterisation of soil conditions with sufficient repeatability, reproducibility and ac- curacy to demonstrate that conservation agriculture systems positively alter the protonic and electronic balance of soil as compared to conventional systems.
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