Practical improvements in soil redox potential (Eh) measurement for characterisation of soil properties. Application for comparison of conventional and conservation agriculture cropping systems

Husson Olivier, Husson Benoit, Brunet Alexandre, Babre Daniel, Alary Karine, Sarthou Jean-Pierre, Charpentier Hubert, Durand Michel, Benada Jaroslav, Henry Marc. 2016. Practical improvements in soil redox potential (Eh) measurement for characterisation of soil properties. Application for comparison of conventional and conservation agriculture cropping systems. Analytica Chimica Acta, 906 : 98-109.

https://doi.org/10.1016/j.aca.2015.11.052

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

	Version Online first - Anglais Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. Husson et al 2015 ACA Eh measurement.pdf Télécharger (2MB) \| Demander une copie
	Version publiée - Anglais Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. 578879_version_editee.pdf Télécharger (2MB) \| Demander une copie

Quartile : Q1, Sujet : CHEMISTRY, ANALYTICAL

Résumé : 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 disequilibrium; 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, pe+pH 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 accuracy to demonstrate that conservation agriculture systems positively alter the protonic and electronic balance of soil as compared to conventional systems.

Mots-clés Agrovoc : potentiel redox, conservation des sols, oxydoréduction, mesure (activité), réaction chimique, agriculture de conservation, système de culture, caractéristiques du sol, propriété physicochimique du sol, méthodologie, matière organique du sol