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Electrically heated cables protect vines from frost damage at early flowering

Electrically heated cables protect vines from frost damage at early flowering Background and Aims: Current methods of frost protection in vineyards involve fans, air heaters or sprinklers; each is limited by environmental constraints or available water. An alternative, all‐electrical technique offers growers wider choice to match options with their vineyard operations. This study evaluates the ability of electrical heating cables, wrapped around the vine cordons, to protect inflorescences from frost damage. Methods and Results: Five heating cable treatments in six replicates were applied to a 2‐ha block of Sauvignon Blanc in the southern New England Region of Australia. Vines were subjected to a single −3°C frost event in November 2006 when at approximately 30% capfall. Non‐heated vines suffered 41% (Control) and 46% (No heat) inflorescence loss. Those subjected to Low heat suffered a 28% loss, Medium‐heated vines suffered a 16% loss and High‐heated vines suffered a 13% loss. Qualitative scoring of the vines indicated that more than half of the Medium‐/High‐heated vines suffered no appreciate damage, whereas all non‐heated vines suffered some form of potential crop loss or damage. Conclusion: Electrical heating cables of minimum 10 W/m power rating were found to significantly reduce frost damage to inflorescences at 30% capfall. Significance of the Study: At approximately 43 kW/ha, electrical heating cable offers an alternative frost protection method for small vineyards. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australian Journal of Grape and Wine Research Wiley

Electrically heated cables protect vines from frost damage at early flowering

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References (10)

Publisher
Wiley
Copyright
© 2008 Australian Society of Viticulture and Oenology Inc.
ISSN
1322-7130
eISSN
1755-0238
DOI
10.1111/j.1755-0238.2008.00034.x
Publisher site
See Article on Publisher Site

Abstract

Background and Aims: Current methods of frost protection in vineyards involve fans, air heaters or sprinklers; each is limited by environmental constraints or available water. An alternative, all‐electrical technique offers growers wider choice to match options with their vineyard operations. This study evaluates the ability of electrical heating cables, wrapped around the vine cordons, to protect inflorescences from frost damage. Methods and Results: Five heating cable treatments in six replicates were applied to a 2‐ha block of Sauvignon Blanc in the southern New England Region of Australia. Vines were subjected to a single −3°C frost event in November 2006 when at approximately 30% capfall. Non‐heated vines suffered 41% (Control) and 46% (No heat) inflorescence loss. Those subjected to Low heat suffered a 28% loss, Medium‐heated vines suffered a 16% loss and High‐heated vines suffered a 13% loss. Qualitative scoring of the vines indicated that more than half of the Medium‐/High‐heated vines suffered no appreciate damage, whereas all non‐heated vines suffered some form of potential crop loss or damage. Conclusion: Electrical heating cables of minimum 10 W/m power rating were found to significantly reduce frost damage to inflorescences at 30% capfall. Significance of the Study: At approximately 43 kW/ha, electrical heating cable offers an alternative frost protection method for small vineyards.

Journal

Australian Journal of Grape and Wine ResearchWiley

Published: Feb 1, 2009

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