Estimation of available nitrogen, total carbon, total nitrogen, and C/N ratios in upland soil using ultra violet-LED induced fluorescence
2019
Orii, K. (Shinshu University (Japan). Faculty Agriculture) | Inoue, N.
Available nitrogen, total carbon, total nitrogen, and C/N ratios in upland soil were estimated using analyses of spectra from a new fluorescence spectrometry system with an ultraviolet light-emitting diode (UV-LED). Forty six samples of andosol were collected from upland agricultural fields, and available nitrogen, total carbon, total nitrogen, and C/N ratios were estimated. Predictive abilities of partial least square models were assessed in a leave-one-out cross-validation procedure based on the entire dataset. The accuracy of calibration models was evaluated using the coefficient of determination and the root-mean-square error. Estimates of available nitrogen, total carbon, total nitrogen, and C/N ratios were highly accurate. Moreover, fluorescence spectroscopy analyses using UV-LED as a light source rapidly provided estimates of these chemical properties, suggesting utility in assessments of plant nutritional conditions and soil fertility.
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