Watch: Running the Phosphorus Index to learn how to calculate Annual Total PI.

These three rows show the Annual Total P Index and its components, the Particulate P Index and Soluble P Index, for every crop year in the rotation. The Annual Total P Index is rounded to the nearest whole number. Information on the P index and how it is calculated can be found at: wpindex.soils.wisc.edu.

For WPDES permitted farms, a fourth row will appear to show the Acute Winter Loss P Index. This is a subcomponent of the Soluble P Index and is displayed for WPDES-permitted farms as it is a requirement for winter emergency spreading plans under NR243.