Abstract
The traditional response of crop to N graph is a linear/plateau model, which has some problems. In contrast, most N rate studies result in a quadratic model. Economists are familiar with the quadratic input rate response and call it “the law of diminishing returns.” New research‐based N rate calculation tools in North Dakota and Montana are based on this. Earn 0.5 CEUs in Nutrient Management by reading this article and taking the quiz at www.certifiedcropadviser.org/certifications/self‐study/725
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