Soil Biology Assessment Calculator

Interpret PLFA soil biology lab results to assess microbial community composition, food web structure, and biological stress indicators.

Total PLFA (nmol/g)

Fungal PLFA (nmol/g)

Bacterial PLFA (nmol/g)

AMF PLFA (nmol/g)

Gram+ bacteria (nmol/g)

Gram- bacteria (nmol/g)

Tab to move between fields

Biology score (0-100)

Fungi:Bacteria ratio0.17

Gram+:Gram- ratio1.25

AMF community share (%)4.4%

Microbial biomass C (μg/g)225

Biomass RatingModerate

Food Web TypeModerately bacterial (typical managed soil)

Stress LevelNormal

How to Use This Calculator

Enter soil respiration rate (CO2 flux) from a Solvita or jar test in ppm per day.
Input your active carbon (POXC) and protein index (ACE protein) values from lab tests.
Set your soil type and tillage history.
Review the Biological Activity Score and the Haney Soil Health Score.
Use the Limiting Factor output to prioritize the input or practice that will yield the largest improvement.

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