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Zeroing in on Nitrogen Efficiency with In-Season Adjustments

Whether using high-tech crop imagery or intuition, in-season nitrogen applications should be adjusted to the crop’s potential as well as future conditions for maximum yield and minimal risk.

With today's sky-high nitrogen (N) prices, nobody wants to apply more N to their crops than is needed. But on the other hand, commodities are commanding a pretty penny, so leaving yield on the table is also ill-advised. 

Mike Zwingman, the agronomy director for Verdesian Life Sciences, says that given the dynamic nature of the N cycle there’s no single solution for N management. But the law of diminishing incremental yield paired with remote sensing technology can help farmers make in-season N adjustments to provide the most yield while reducing the risk of loss.

Dynamic System

The starting point for Zwingman is identifying the optimum zone for N application between the “point of diminishing returns” and the “point of maximum yield” (figure 1). “Every bushel before the point of diminishing returns is less expensive than the ones that come after it,” he says. Between the two points, “every additional pound of N is giving us a little less yield, and every time you go past the point of maximum yield, you have N that is going unused and can be lost from leaching, nitrification or denitrification.” He says using an N stabilizer is also critical to help prevent N loss.

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ON POINT. Research shows the financial returns from applying nitrogen (N) is not linear. After the point of maximum yield, applied N is at risk of loss, and less profitable per bushel added.

Click to enlarge

Making Adjustments

Imagery and tissue sampling make it easier to make objective decisions about…

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Julia gerlach web

Julia Gerlach

Julia Gerlach is Executive Editor of No-Till Farmer. She has a lengthy background in publishing and a longtime interest in gardening and mycology. She graduated with a B.A. in music and philosophy from Alverno College in Milwaukee, Wis.

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