Maps of the economically optimum N rate for a 30-acre corn field near Windom, MN, in 1997 and 1999. The N rates are overlain on a block diagram to show the topographic relief in the field (Figures provided by Gary Malzer, University of Minnesota).

Image from the Plant Management Network Image Collections.
Source: Crop Management - Variable-Rate Nitrogen Management Creates Opportunities and Challenges for Corn Producers

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