University of Maryland Extension

6. Calculating the Phosphorus Site Index (PSI) and the University of Maryland Phosphorus Management Tool (UM-PMT)

Step 6. Calculating the Phosphorus Site Index (if fields have an FIV-P greater than or equal to 150)

The Phosphorus Site Index (PSI) is a field-by-field tool designed to identify critical areas where there is a high phosphorus loss potential and a large source of phosphorus present in the soil. The UM-PMT is replacing the PSI in the near future.

The following worksheets and information sheets will assist you with the PSI/UM-PMT step of nutrient management plan development.

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