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Dunn County Extension outlines nitrogen-management results and previews Healthy Water Summit
Summary
At a March committee meeting, Dunn County Extension presented field and pilot-study data showing manure can supply large nitrogen credits and that in one trial extra commercial nitrogen above about 40 lb/acre delivered no economic benefit; extension announced a Healthy Water Summit with UW–Madison participation.
Jerry Clark, soils and crops educator with Dunn County Extension, presented a series of on‑farm and pilot‑scale studies to the Community Resources and Tourism Committee on March 17, summarizing findings on nitrogen management, manure crediting and nitrate movement ahead of a regional Healthy Water Summit.
The presentation framed agriculture’s local scale: Clark said agriculture accounts for nearly $400 million in market value in Dunn County, with product sales just over $300 million and roughly 1,200 farms reported in the 2022 Census of Agriculture. He then reviewed results from small‑plot adaptive nitrogen trials and a Nitrogen Optimization Pilot (NOP) conducted across the region.
Clark described small‑plot trials that tested seven nitrogen rates (0–200 lb/acre). "In 2025, once we got to about 40 pounds of nitrogen, it didn't pay to put any more on after that," he said, adding that in that field extra nitrogen above that level would be "basically throwing money…
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