Soil Protein Calculator

Interpret autoclave-citrate extractable (ACE) soil protein results to estimate nitrogen mineralization potential and fertilizer credits.

ACE soil protein (mg/g)

Soil organic matter (%)

Clay content (%)

Growing season length (days)

Tab to move between fields

Protein rating (0-100)

N mineralization (lb N/ac)3.3

Fertilizer N credit (lb N/ac)2.2

Fertilizer value ($/ac)$1

Protein:OM ratio4

ACE protein (mg/g)12

RatingModerate

Om QualityGood quality

How to Use This Calculator

Enter your ACE soil protein index (SPI) value from a lab test in mg/kg.
Input soil texture class and land use history.
Set your target nitrogen-release goal in lbs per acre.
Review the Estimated Mineralizable Nitrogen and the Soil Protein Rating.
Use the Recommended Nitrogen Credit to adjust synthetic fertilizer rates accordingly.

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