September 2 Webinar: Long-Term Impacts of 4R Nitrogen Management Practices and Cover Crops on Nitrate-N Loss

August 26, 2020

AMES, Iowa—Iowa Learning Farms will host a webinar on Wednesday, September 2 at noon about the impacts of nitrogen management practices and cover crops on downstream nitrate-N loss.  

The 4Rs of nitrogen management are right source, right rate, right time, and right place. Right source refers to using the correct fertilizer for the soil and crop needs, right rate means that the application rate matches the crop requirements, right time means ensuring that nitrogen is available when the crop needs it, and right place refers to placing and keeping nitrogen where the crop can get to it. Matt Helmers, Director of the Iowa Nutrient Research Center, will explain the long-term impacts of using nitrogen management practices, as well as the use of cover crops, on nitrate-N loss from agricultural systems.

Applying nitrogen closer to when crops take it up has the potential to reduce nitrogen loss. Future nitrogen management will need to take the dry conditions of summer 2020 into consideration and cover crops may be an important tool for reducing risk of increased nitrogen loss during subsequent wet periods.

“Agricultural producers are increasingly challenged to reduce downstream nitrate-N loss. The first step in reducing nitrogen loss is good in-field nitrogen management,” said Helmers, a research and extension agricultural engineer who focuses on agricultural water quality, specifically nitrate-N loss through drainage systems.

To participate in the live webinar, shortly before 12:00 pm CDT on September 2:

Click this URL, or type this web address into your internet browser:

    Or, go to and enter meeting ID: 364 284 172 


Or, join from a dial-in phone line:

    Dial: +1 312 626 6799 or +1 646 876 9923

    Meeting ID: 364 284 172


The webinar will also be recorded and archived on the ILF website, so that it can be watched at any time. Archived webinars are available at

A Certified Crop Adviser board-approved continuing education unit (CEU) has been applied for, for those who are able to participate in the live webinar. Information about how to apply to receive the credit (if approved) will be provided at the end of the live webinar.

Established in 2004, Iowa Learning Farms is building a Culture of Conservation by encouraging adoption of conservation practices. Farmers, researchers and ILF team members are working together to identify and implement the best management practices that improve water quality and soil health while remaining profitable. Partners of Iowa Learning Farms include the Iowa Department of Agriculture and Land Stewardship, Iowa State University Extension and Outreach, Leopold Center for Sustainable Agriculture, USDA Natural Resources Conservation Service, and Iowa Department of Natural Resources (USEPA section 319) and GROWMARK, Inc.


Hilary Pierce                                       Jacqueline Comito

Extension Outreach Specialist            ILF Program Director                 

515-294-8912                                      515-296-0081