Title:	Hyperspectral data analysis for chlorophyll content derivation in vineyards.
Authors:	ARRUDA, D. C. de DUCATI, J. R. PITHAN, P. A. HOFF, R.
Affiliation:	DINIZ CARVALHO DE ARRUDA, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; JORGE RICARDO DUCATI, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; PÂMELA AUDE PITHAN, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; ROSEMARY HOFF, CNPUV.
Date Issued:	2024
Citation:	Ciência Rural, v. 54, n. 7, e20220558, 2024.
Description:	Quality and yield of a vineyard are related to canopy biomass and leaf vigor, and proximal techniques have been used as alternatives to conventional methods to estimate these parameters. Knowledge on chlorophyll content is crucial to plant health assessments. However, chlorophyll indices can also be extracted from reflectance spectra obtained for an ample range of applications. In this perspective, relations between chlorophyll indices obtained by direct measurements and derived from field radiometry were investigated, with the aim to assess the accuracy of predicted chlorophyll content. The investigation was performed on Cabernet Sauvignon vines, being based on direct chlorophyll surveys, vine leaf spectroradiometry and the derivation of Hyperspectral Vegetation Indices (HVIs), with data acquisition being performed on two stages of the vegetative cycle. Direct chlorophyll data was compared with predicted indices using two machine learning algorithms: Partial Least-Squares Regression (PLSR) and Random Forest Regressor (RFR), using data from reflectance spectra and derived HVIs. The higher correlations between measurements and predictions were obtained for Chl a and Chl a/Chl b modeled by the RFR algorithm, with R2 values as high as 0.8 and Root Mean Squared Errors as low as 0.093. With respect to HVIs, the Photochemical Reflectance Index (PRI) calculated for the second acquisition date, corresponding to leaves reaching senescence was the one which produced the highest percentage of prediction explanations. This study can bring a significant contribution to the development of non-invasive techniques to vine monitoring.
NAL Thesaurus:	Vineyards
Keywords:	Hyperspectral Partial least-squares regression Random forest regressor
ISSN:	e 1678-4596
DOI:	http://doi.org/10.1590/0103-8478cr20220558
Type of Material:	Artigo em anais e proceedings
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPUV)