Manure Nutrient Management Planning

Greg Brenneman, Field Specialist-Ag Engineering, Southeast Area

Problem Statement: 

Current Iowa regulations require the implementation of the Iowa P index for manure management plans.  Producers have requested assistance with understanding, calculating, and implementing the P index into manure management plans.

Programmatic Response: 

Information on the P-index was included as a part of the Manure Applicator Certification Program.  In the past year I assisted 34 producers in filling out or updating their IDNR Manure Management Plans. For a number of producers this included calculations of the P-Index for their fields. By working with the producers in filling out the MMP forms, I was able to help them understand how the manure application rates were being calculated, the nitrogen availability in the manure based on plot trials in SE Iowa, and how the necessary record keeping with the plans.


In working with the 34 producers, approximately 23,000 acres were impacted by the manure management plans.  Total value of the crop nutrients being applied in the manure is approximately $700,000 per year.  By improving nitrogen utilization practices through better manure management planning, these producers saved about $50,000 in reduced fertilizer costs.

April 18, 2007
160 - Natural Resources and Stewardship


Page last updated: April 25, 2007
Page maintained by Linda Schultz,