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Potential effectiveness of visible and near infrared spectroscopy coupled with wavelength selection for real time grapevine leaf water status measurement
Author(s) -
Giovenzana Valentina,
Beghi Roberto,
Parisi Simone,
Brancadoro Lucio,
Guidetti Riccardo
Publication year - 2017
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8676
Subject(s) - near infrared spectroscopy , partial least squares regression , computer science , wavelength , range (aeronautics) , environmental science , remote sensing , materials science , optics , machine learning , optoelectronics , physics , composite material , geology
BACKGROUND Increasing attention is being paid to non‐destructive methods for water status real time monitoring as a potential solution to replace the tedious conventional techniques which are time consuming and not easy to perform directly in the field. The objective of this study was to test the potential effectiveness of two portable optical devices (visible/near infrared (vis/NIR) and near infrared (NIR) spectrophotometers) for the rapid and non‐destructive evaluation of the water status of grapevine leaves. Moreover, a variable selection methodology was proposed to determine a set of candidate variables for the prediction of water potential ( Ψ , MPa) related to leaf water status in view of a simplified optical device. RESULTS The statistics of the partial least square (PLS) models showed in validation R 2 between 0.67 and 0.77 for models arising from vis/NIR spectra, and R 2 ranged from 0.77 to 0.85 for the NIR region. The overall performance of the multiple linear regression (MLR) models from selected wavelengths was slightly worse than that of the PLS models. Regarding the NIR range, acceptable MLR models were obtained only using 14 effective variables ( R 2 range 0.63–0.69). CONCLUSION To address the market demand for portable optical devices and heading towards the trend of miniaturization and low cost of the devices, individual wavelengths could be useful for the design of a simplified and low‐cost handheld system providing useful information for better irrigation scheduling. © 2017 Society of Chemical Industry