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Protecting wine grapes from heat and drought
Date:2/17/2009

PARMA, IDDeficit irrigation is an agricultural technique used to achieve a variety of results depending on the crop. For white wine grapes, it balances the crop load by limiting the canopy size so there aren't too many leaves shading the grapes. For red wine grapes, deficit irrigation again limits canopy size, but also affects berry components associated with wine quality.

A drawback of this canopy-limiting process is that fruit can become sunburned, especially under sunny, arid conditions, which can adversely affect productivity and fruit maturity. A particle film, which increases light reflection and reduces leaf temperature, has been tested on several crops. It acts as a sunscreen by reflecting the harmful ultraviolet rays off of the leaves and fruit, but still allows the right radiation for photosynthesis through to nourish the plant.

Krista Shellie of the U.S. Department of Agriculture led a study to learn more about foliar particle film's effects on wine grapes when the grapes were grown under varying levels of water stress. The study, published in the American Society for Horticultural Science journal HortScience, also noted particle film's effect on grape yield and maturity. Grapes were grown according to commercial practice with the exception of the watering schedule and application of the particle film. Film effectiveness was monitored by measuring the amount of leaf gas exchange, but particle film's influence on this process seemed to differ depending on the amount of water stress the vine was experiencing.

Particle film did not prevent sunburn on exposed fruit when vines were under the most stressful growing conditions, but did increase the weight of a red-skinned wine grape by 7% and increased a white-skinned wine grapes' soluble solids concentration by 11%. But, the weight of white-skinned wine grape and the soluble solids concentration of the red-skinned grape were unaffected. Other factors pertaining to yield, i
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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

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