Structure-activity relationship study in soil identifies an effective broad-spectrum inhibitor of archaeal nitrification

Optimized SIAS (Opt. SIAS) is a simplified pyrazolo-pyridine analogue that consistently outperformed the original SIAS lead compound across diverse agricultural soils in inhibiting archaeal nitrification.

• Why it matters: Effective AOA-targeting nitrification inhibitors are scarce, and soil-dependent factors make pure-culture performance hard to predict.
• What they did: Using a high-throughput miniaturized soil incubation assay, the study tested 27 SIAS-derived pyrazolo-pyridine analogues in soil for a structure-activity relationship, then correlated efficacy with soil properties.
• The result: Soil pH and especially silt content were major determinants of Opt. SIAS efficacy, and Opt. SIAS combined additively with DMP (3,4-dimethyl-1H-pyrazole) to suppress residual nitrification.

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