PAN Calculator

Plant Available Nitrogen (PAN) method must be used by concentrated animal feeding operations (CAFOs) to determine the nitrogen fertilizer value of manure. Manure application rates for a field is calculated using the PAN estimate and a target fertilizer nitrogen rate for a field.

The calculations used by this calculator are detailed in MU Guide G9186 “Calculating Plant-Available Nitrogen and Residual Nitrogen Value in Manure.”  Contact John Lory if you have questions or comments.

To calculate PAN you need to have an estimate of manure nutrient concentration, information on the type of animals, information on use of bedding and information on the method of manure application. Enter the requested information to determine PAN for a source of manure.

Facility ID Entry (optional)
Manure Test Data Entry
Manure Test Basis
Manure Solids
Reported as
Manure Application Information

Plant Available Nitrogen Calculator
Results Report

Ver. 0.7

Operation Information

Operation Name:

Manure Storage ID:

Planner Name:

Planner email:

Converted Manure Test Results - As-is Basis

Total Nitrogen: lbs/ton
Organic Nitrogen: lbs/ton
Ammonium Nitrogen: lbs/ton
Nitrate Nitrogen: lbs/ton
Phosphate: lbs/ton
Potash: lbs/ton
Moisture Content:%

Manure Application Information

Manure Application Equipment:

Days to Incorporation:

Plant Available Nitrogen (PAN)


Residual Nitrogen Fertilizer Value (RNFV):

Availability factors used:

  • k1(Y1), organic N, year 1:
  • k1(Y2), organic N, year 2:
  • k2(NH4), ammonium N:
  • k2(NO3), Nitrate N: 1.0

Recommended Manure Application Rate

Target Fertilizer N Rate: lbs/acre
Manure Application Rate:
Phosphate Applied: lbs/acre
Potash Applied: lbs/acre
Year 2 residual fertilizer N value: lbs/acre