Summary
Weinrich et al. present a practical, low-cost assay for on-site detection of soil microbial activity using smartphone imaging of pH-indicator colour changes induced by microbial CO₂ production. Validated across 13 Eastern Austrian sites with diverse land uses and substrates, the method demonstrated strong correlations with laboratory reference measurements and identified alfalfa as a suitable standard substrate without indicator saturation. Image pre-processing techniques further improved reproducibility under field conditions, offering farmers and advisors an accessible tool aligned with EU Soil Strategy 2030 objectives.
Regional applicability
The methodology is directly transferable to UK farming contexts, where on-farm soil health monitoring remains limited by cost and infrastructure barriers. UK farmers, extension services and environmental stewardship schemes could adopt this tool to assess biological soil function in diverse systems (arable, pasture, conservation margins), though validation across UK soil types and climatic conditions would strengthen applicability.
Key measures
Microbial respiration quantified through pH-indicator colour change detected via smartphone imaging; correlations with reference measurements (r² values); effects of substrate amendments (glucose, milled alfalfa, milled straw) on indicator saturation and reproducibility
Outcomes reported
The study developed and validated a low-cost, smartphone-based assay that quantifies soil microbial respiration via CO₂-induced pH-indicator colour change. The method was tested across 13 sites in Eastern Austria under different land uses and substrate amendments, showing strong correlations with reference measurements (r² up to 0.76).
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