The Wisconsin P Index is one of the manure phosphorus management strategies used in planning to meet Wisconsin’s Nutrient Managment Planning Standard 590.
The P Index is calculated as part of nutrient managment planning with SNAP-Plus software. Anyone can download this software, with instructions for use, from the Snap-Plus website.
SNAP-Plus allows interactive evaluation of P Index values with changing field management practices such as manure application rate and timing, crop rotations, and tillage. P Index values for each field can be found in Snap-Plus reports and on the Snap-Plus Cropping screen.