A growing number of researchers are looking at how the 4Rs of nutrient application—source, rate, time, and place—affect crop uptake and yields. This article begins a new series from The Fertilizer Institute highlighting some of the latest 4R research. Earn 0.5 CEUs in Nutrient Management by reading this article and taking the quiz at www.certifiedcropadviser.org/certifications/self‐study/825 .
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