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Nitrogen management for first-year corn after alfalfa

Dr. Jeff Coulter, Extension Agronomist, University of Minnesota Published on 13 April 2012
Sampling to 4 feet for residual soil nitrate-N

Rotating alfalfa with corn can increase corn yield potential due to improved soil physical properties that enhance water infiltration and root extension, altered soil microbial communities and reduced pest pressure.

In addition, fertilizer nitrogen (N) requirements are commonly reduced by about 100 percent for first-year corn and 50 percent for second-year corn following a good stand of alfalfa. However, N guidelines for corn after alfalfa vary among Corn Belt states and growers have questioned the reliability of alfalfa N credits in high-yield environments.

In the webcast presentation, results are shared from 33 recent on-farm N rate trials in first-year corn after alfalfa in the Upper Midwest. This presentation will help viewers understand factors that affect the response of first-year corn to fertilizer N and will address related issues such as alfalfa termination timing, alfalfa regrowth prior to termination and side-dressing of N.

Click here to view the webcast.  FG

—University of Minnesota's Plant Management Network International webcast

PHOTO
Sampling to 4 feet for residual soil nitrate-N. Photo courtesy of University of Minnesota.

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Dr. Jeff Coulter
Extension Agronomist
University of Minnesota



 

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