University of Maryland Extension

tiers

PSI, PMT, and the Tier System: What You Need to Know

The Phosphorus Site Index (PSI) and the Phosphorus Management Tool (PMT) are tools used to determine the risk for phosphorus runoff into nearby waterways. The PSI has been used for many years on fields with a Fertility Index Value (FIV) of 150 or greater. This is used to determine the safety of...
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