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Dr. Gordon Johnson discovered that the N fertilizer rate needed to maximize
yields varied widely over years and was unpredictable in several long-term
experiments. This led to his development of the RESPONSE INDEX.
Ensuing work by the Soil Fertility Project aimed to predict what the
potential response to applied N would be using sensor measurements collected
in-season. This approach allowed us to predict the magnitude of response
to topdress fertilizer, and in time to adjust topdress N based on a projected
'responsiveness'.
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