Every month, farmers and agronomists spend $55–85 per sample on PLFA soil biology tests — and then struggle to know what the numbers actually mean.

In this episode, Dr. Saurav Das breaks down phospholipid fatty acid analysis: what it measures, why it's the most reproducible method for quantifying living microbial biomass in soil, and — crucially — where the science still falls short.

You'll learn:

• Why no scientifically validated thresholds exist for "good" or "bad" PLFA values — and what that means for your decision-making

• What the fungal-to-bacterial ratio actually tells you (and what it doesn't)

• How cover cropping increases total microbial biomass by 24%, no-till by 37%, and organic amendments by 59% — according to meta-analyses across 60–80 studies

• Why sample handling errors (a soil sample sitting in a truck cab) can shift your fungal markers by 40%

• The most honest current guidance: use PLFA as a trajectory tool, not a diagnostic one

Based on the peer-reviewed research brief published on Soil Health Exchange.

Full article with data tables, management decision charts, and references:

soilhealthexchange.com/blog/plfa-analysis-soil-biology-testing

Soil Health Exchange connects farmers and agronomists with evidence-based soil science. New episodes follow published field answers and research briefs.

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