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Iowa Learning Farms Webinar: Watershed-Scale N-Load Model Update Facilitates Data Analysis and Reduction Strategies

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Iowa Learning Farms Webinar: Watershed-Scale N-Load Model Update Facilitates Data Analysis and Reduction Strategies

July 27, 2022 @ 12:00 pm

July 27 presentation features Iowa State University’s Kay Stefanik discussing revisions to the INRS N-Load Model to better understand watershed-scale nutrient management outcomes


The Iowa Learning Farms (ILF) conservation webinar taking place July 27 at noon CDT will feature Dr. Kay Stefanik, assistant director, Iowa Nutrient Research Center (INRC) at Iowa State University. Dr. Stefanik’s expertise and research is in water quality, nutrient cycling and aquatic ecosystems. In her work with water quality initiatives through the INRC, she has been directly involved in assessing progress toward Iowa’s nutrient reduction goals.

Iowa Learning Farms is an Iowa State University Extension and Outreach conservation and water quality education program.

In the webinar, “Improving Flexibility of the Iowa Nutrient Reduction Strategy N-Load Model: Use at the Watershed Scale,” Stefanik will discuss recent revisions to the Iowa Nutrient Reduction Strategy (INRS) N-Load model to enable direct comparisons of modeled estimates with U.S. Geological Survey (USGS) water quality data collected at the watershed scale. She will also highlight uses of the N-Load model including estimation of watershed scale nitrate-N loss. In addition, Stefanik will cover opportunities to forecast future nitrate-N reductions enabled through increased practice implementation such as use of cover crops, conversion to no-till, changes in manure and fertilizer use and installation of edge-of-field practices.

“The INRS N-Load model was developed to estimate nitrate-N loss to surface waters on a Major Land Resource Area (MLRA) scale, which is not readily comparable to USGS water quality data that is commonly published in relation to watershed areas,” said Stefanik. “The revision of the N-Load model at the watershed scale, aids in the development of more targeted watershed approaches to nutrient management for nitrate reductions.”

Participants in Iowa Learning Farms Conservation Webinars are encouraged to ask questions of the presenters. People from all backgrounds and areas of interest are encouraged to join.


Webinar Access Instructions

To participate in the live webinar, shortly before noon CDT July 27:

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. Those who participate in the live webinar are eligible. Information about how to apply to receive the credit will be provided at the end of the live webinar.


Upcoming Webinars in the Series:

8/3: Michael Burchell, North Carolina State University8/10: Daniel Andersen, Iowa State University

8/17: Jorgen Rose, Practical Farmers of Iowa

8/24: Peter O’Brien, USDA Agriculture Research Service


July 27, 2022
12:00 pm


Iowa Learning Farms
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