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BACKGROUND
Active optical crop sensors have been gaining importance to determine in‐season nitrogen (N) fertilization requirements for on‐the‐go variable rate applications. Although most of these active in‐field crop sensors have been evaluated in maize (Zea mays L.) and wheat (Triticum aestivum L. emend. Thell.), these sensors have not been evaluated in soybean [Glycine max (L.) Merr.] production...