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. 2019 Nov 28;19(23):5244. doi: 10.3390/s19235244

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) PLSR of Fe data for the first field (UV range), red points represent calibration data (R² = 0.986), blue diamonds represent 20-fold cross-validation (R² = 0.70), (b) application of PLSR of Fe data to the second field R² = 0.37, (c) PLSR of Mg data for the first field (UV range), red points represent calibration data (R² = 0.96), blue diamonds represent 20-fold cross-validation R² = 0.79, (d) application of PLSR of Fe data to the second field R² = 0.38.

(a) PLSR of Fe data for the first field (UV range), red points represent calibration data (R² = 0.986), blue diamonds represent 20-fold cross-validation (R² = 0.70), (b) application of PLSR of Fe data to the second field R² = 0.37, (c) PLSR of Mg data for the first field (UV range), red points represent calibration data (R² = 0.96), blue diamonds represent 20-fold cross-validation R² = 0.79, (d) application of PLSR of Fe data to the second field R² = 0.38.