Summary
This field-based evaluation assessed 13 soil organic matter properties and a commercial soil health index across five long-term agroecosystem experiments in the inland Pacific Northwest to identify the most useful metrics for soil health monitoring. The authors propose seven evidence-based criteria to evaluate soil health tools and found that permanganate oxidisable carbon (POXC) performed most strongly, correlating well with more stabilised soil carbon and nitrogen pools (r = 0.84 and r = 0.80 respectively) whilst remaining sensitive to management. The study concludes that POXC, ideally paired with ion exchange membrane nitrogen, should be prioritised for soil health assessment in this region.
UK applicability
The methodology and evaluation criteria proposed here are applicable to UK soil health monitoring programmes, though the specific performance rankings of individual metrics may differ under UK climatic, soil type, and management conditions. The emphasis on selecting metrics that balance sensitivity, cost-effectiveness, and practical utility is particularly relevant for UK farm advisory and regulatory frameworks.
Key measures
Soil organic carbon (SOC), total nitrogen, acid nonhydrolyzable carbon (NHC), acid nonhydrolyzable nitrogen (NHN), acid-hydrolysable carbon (HC), acid-hydrolysable nitrogen (HN), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), carbon mineralisation (Cmin), permanganate oxidisable carbon (POXC), ion exchange membrane nitrogen (IEM N), potential nitrogen mineralisation (PNM), and Haney soil health index (SHindex)
Outcomes reported
The study evaluated 13 different soil organic matter (SOM) properties and the Haney soil health index across five long-term field experiments (2–30 years old) in the inland Pacific Northwest. Permanganate oxidizable carbon (POXC) was identified as the most effective soil health metric based on seven evaluation criteria: evidence base, sensitivity to change, logistical feasibility, cost-effectiveness, accuracy and precision, in situ performance, and management relevance.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.