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Non-destructive measurement of grapevine water potential using near infrared spectroscopy

journal contribution
posted on 08.08.2018, 00:00 by R De Bei, Daniel CozzolinoDaniel Cozzolino, W Sullivan, W Cynkar, S Fuentes, R Dambergs, J Pech, S Tyerman
Background and Aims: Near infrared (NIR) spectroscopy techniques are not only used for a variety of physical and chemical analyses in the food industry, but also in remote sensing studies as tools to predict plant water status. In this study, NIR spectroscopy was evaluated as a method to estimate water potential of grapevines. Methods and Results: Cabernet Sauvignon, Chardonnay and Shiraz leaves were scanned using an Integrated Spectronic (300-1100nm) or an ASD FieldSpec® 3 (Analytical Spectral Devices, Boulder, Colorado, USA) (350-1850nm) spectrophotometer and then measured to obtain midday leaf water potential using a pressure chamber. On the same shoot, the leaf adjacent the one used for midday leaf water potential measurement was used to measure midday stem water potential. Calibrations were built and NIR showed good prediction ability (standard error in cross validation (SECV) <0.24MPa) for stem water potential for each of the three grapevine varieties. The best calibration was obtained for the prediction of stem water potential in Shiraz (R=0.92 and a SECV=0.09MPa). Conclusion: Differences in the NIR spectra were related to the leaf surface from which the spectra were collected, and this had an effect on the accuracy of the calibration results for water potential. We demonstrated that NIR can be used as a simple and rapid method to detect grapevine water status. Significance of the Study: Grapevine water potential can be measured using NIR spectroscopy. The advantages of this new approach are speed and low cost of analysis. It may be possible for NIR to be used as a non-destructive, in-field tool for irrigation scheduling. © 2010 Australian Society of Viticulture and Oenology Inc.

Funding

Category 2 - Other Public Sector Grants Category

History

Volume

17

Issue

1

Start Page

62

End Page

71

Number of Pages

10

eISSN

1755-0238

ISSN

1322-7130

Publisher

Wiley-Blackwell Publishing Asia

Peer Reviewed

Yes

Open Access

No

Acceptance Date

16/09/2010

External Author Affiliations

University of Adelaide; Australian Wine Research Institute; University of Tasmania; South Australian Research and Development Institute

Era Eligible

Yes

Journal

Australian Journal of Grape and Wine Research

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