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Fig. 1. Average visible and near infrared spectra recorded on soil samples of the single-field dataset for Groups 1 (0.00.025 kg kg1), 5 (0.0260.075 kg kg1), 10 (0.0760.125 kg kg1), 15 (0.1260.175 kg kg1), 20 (0.1760.225 kg kg1), and 25 (0.2260.275 kg kg1) (a) before normalization, and (b) after normalization (normalization adopted before principal component analysis).
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