> For the complete documentation index, see [llms.txt](https://rhizobiome.gitbook.io/eiwa-shop-supports-et-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://rhizobiome.gitbook.io/eiwa-shop-supports-et-documentation/les-protocoles-sante-du-sol/situresp-r/principe-experimental.md).

# Principe expérimental

SituResp® estime les émissions en CO2 d’un échantillon de sol frais et tamisé grossièrement. Le sol est déposé dans un bocal hermétique auquel on ajoute une cuvette contenant un gel coloré dont la couleur est sensible aux variations de pH. Le CO2 émis par l’activité biologique du sol est capté par le piège alcalin contenu dans le gel, et modifie le pH et la couleur du gel. La mesure du changement de couleur du gel (via une différence d’absorbance à 570 nm) permet d’estimer la quantité de CO2 émise par le sol.


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