Influence of the number of samples on prediction error of visible and near infrared spectroscopy of selected soil properties at the farm scale

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Accurate and Precise Prediction of Soil Properties from a Large Mid-Infrared Spectral Library (2019, background): “Visible (vis; 400–700 nm), near-infrared (NIR; 700–2500 nm), and mid-infrared (MIR; 2500–25,000 nm) regions have been used widely to characterize soil minerals and organic matter at the global [5,7,8], regional [9,10], national [11,12] and local scale [13].”
Sampling optimal calibration sets in soil infrared spectroscopy (2014, background): “Despite the well-known potential of vis–NIR spectroscopy to obtain soil information at high spatial resolution, research on both the sampling strategy and the adequate calibration set size has not received enough attention (Grinand et al., 2012; Kuang and Mouazen, 2012).”