Preparing for fall manure application

AMES – As harvest season begins across Iowa, it is also time to turn attention to fall manure application.

According to Dan Andersen, associate professor and extension agriculture engineering specialist at Iowa State University, proper preparation now ensures manure is effectively used as a nutrient resource, supports soil health and protects water quality.

The Iowa State University Extension and Outreach agricultural engineering team has shared its annual guide on best practices for fall manure application. This resource covers everything from manure testing and equipment calibration to optimal timing, soil conditions and safety.

Seasoned applicators and those new to the practice are encouraged to review these reminders to help ensure compliance, efficiency and environmental stewardship.

Before heading out to the field, applicators should make sure their Manure Applicator Certification is up to date. Iowa law requires certification for both commercial and confinement site manure applicators.

There are three convenient options to complete 2025 certification:

Visit your county extension office to view a training video.

Complete certification online training, including payment, through the Iowa DNR.

Schedule a testing appointment at your nearest DNR Field Office.

Early certifications can help avoid delays during application season.

For more information on certification or to access training materials, contact your county extension office or visit the Iowa DNR Manure Applicator Certification website.