Canopy Temperature as a Water Stress Indicator in Vines

  • J.L. Van Zyl Viticultural and Oenological Research Institute, Stellenbosch
DOI: https://doi.org/10.21548/7-2-2326

Abstract

Canopy temperature (CT) of vine plots subjected to drying cycles, and of well-watered control plots was measured with the aid of an infra-red thermometer in a full-bearing Colombar vineyard together with measurements of leaf water potential (LWP) and stomata) resistance (Rs). A decrease in transpiration rate due to water stress caused plant temperature to rise above that of the non-stressed control. A maximum temperature difference of 3,2°C was obtained. The infra-red thermometer proved itself accurate and facilitated rapid temperature determinations while measurements of CT integrated temperatures of individual leaves. Canopy temperature was significantly and linearly correlated with soil water content (SWC). The study indicated that the onset of vine water stress occurred at plant available water contents of 30% - 50%, coinciding with a CT increase of 1,l6°C - 1,62°C above that of the control.

Downloads

Download data is not yet available.
Published
2017-05-09
Issue
Vol. 7 No. 2 (1986)
Section
Articles

Copyright (c) 2017 South African Society for Enology and Viticulture

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

A copyright form will be e-mailed to the corresponding author when the manuscript has been accepted for publication.

 

In principle, the Author agrees to the following when he/she signes the copyright agreement:

I hereby assign to the SOUTH AFRICAN SOCIETY FOR ENOLOGY AND VITICULTURE (SASEV) the copyright of the text, tables, figures, supplementary material, illustrations and other information (the Material) submitted with the manuscript to be published in SOUTH AFRICAN JOURNAL OF ENOLOGY AND VITICULTURE (SAJEV) (the "Article"). The copyright becomes effective from the date the Article has been accepted for publication in SAJEV.

 

This is an open access journal, and the authors and journal should be properly acknowledged, when works are cited.

Author's may use the publishers version for teaching purposes, in books, theses, dissertations, conferences and conference papers.

A copy of the authors' publishers version may also be hosted on the following websites:

  • Non-commercial personal webpage or blog.
  • Institutional webpage.
  • Authors Institutional Repository.

The following notice should accompany such a posting on the website: This is an electronic version of an article published in SAJEV, Volume XXX, number XXX, pages XXX - XXX, DOI.   Authors should also supply a hyperlink to the original paper or indicate where the original paper (www.journals.ac.za/index.php/sajev/) may be found.

Authors publishers version, affiliated with the Stellenbosch University will be automatically deposited in the University's Institutional Repository SUNScholar.

Articles as a whole, may not be re-published with another journal.

The following license applies:

Attribution CC BY-NC-ND 4.0