How much nitrogen does corn get from fertilizer? Less than farmers think

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Corn growers seeking to increase the amount of nitrogen taken up by their crop can adjust many aspects of fertilizer application, but recent studies from the University of Illinois Urbana-Champaign show those tweaks don’t do much to improve uptake efficiency from fertilizer. That’s because, the studies show, corn takes up the majority of its nitrogen—about 67% on average—from sources occurring naturally in soil, not from fertilizer.

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