Sidedressing nitrogen: The rationale, past research & potential risks in split-applying
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University of Minnesota Extension’s two-day field School for Ag Professionals is coming up July 29 and July 30, 2026. If you’re an agronomist, a retailer, dealer or consultant, if you’re a summer field scout - we encourage you to attend these small-group, hands-on sessions led in the field by experienced instructors. Early bird registration ends July 1, and 12 Certified Crop Advisor CEUs credits are available. For all the details, including info on lodging, visit z.umn.edu/agfieldschool2026
Brad Carlson and Dan Kaiser discuss sidedressing in today's Advancing Nitrogen Smart Podcast episode. What's the big-picture rationale behind sidedressing? How can sidedressing or split-applying be beneficial in terms of avoiding nitrogen loss? Since nitrogen uptake isn't linear, what growth stages coincide with peak daily demand on the crop? Are there any significant risks in starting a sidedress application early in the season? What have past experiments shown regarding positive and / or negative responses to sidedressing? How should inhibitors be used with sidedress / topdress? What should farmers know about soil types and tile drainage when making sidedress decisions? This and much more on the 37th episode of the Advancing Nitrogen Smart podcast series.
Guests:
- Brad Carlson, Extension educator (Mankato)
- Dan Kaiser, Extension nutrient management specialist (St. Paul)
Additional resources:
- Things to consider when sidedressing nitrogen
- Split-applying nitrogen for corn: Three keys for successful sidedress applications (YouTube)
- What's the right PSNT number? New research refines the critical threshold for corn nitrogen decisions in Minnesota
- Are split applications of nitrogen fertilizer in Minnesota worth it?
- Supplemental nitrogen fertilizer: Is it time to pull the trigger?
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For the latest nutrient management information, subscribe to the Nutrient Management Podcast. And don't forget to subscribe to the Minnesota Crop News daily or weekly email newsletter, subscribe to our YouTube channel, like UMN Extension Nutrient Management on Facebook, follow us on X (formerly twitter), and visit our website.
If you have questions or comments, please email us at nutmgmt@umn.edu.
Advancing Nitrogen Smart is proud to be supported by the farm families of Minnesota and their corn check-off investment through Minnesota Corn.
Remember to register for Ag Field School 2026 at the University of Minnesota: z.umn.edu/agfieldschool2026