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|Title:||Using remote sensing to predict grape phenolics and colour at harvest in a Cabernet Sauvignon vineyard: Timing observations against vine phenology and optimising image resolution||Contributor(s):||Lamb, D (author); Weedon, MM (author); Bramley, RGV (author)||Publication Date:||2004||Handle Link:||https://hdl.handle.net/1959.11/91||Abstract:||Optical remote sensing can provide a synoptic view of grapevine photosynthetically-active biomass over entire vineyards both rapidly and cost-effectively. Such output offers viticulturists and winemakers a management tool of enormous potential with red grape varieties, especially if canopy architecture (defined in this way) can be linked to production of phenolics and colour in ripe grapes. Accordingly, this paper describes such associations for a Cabernet Sauvignon vineyard in Australia's cool-climate Coonawarra region. A link is established between physical descriptors of grapevine canopies (derived from remotely-sensed images), and subsequent measurements of grape phenolics and colour. High-resolution images were acquired on three occasions during each of two consecutive growing seasons and post-processed to a range of on-ground resolutions. The strength of correlation between those images and berry properties (both total phenolics, and colour levels at harvest), varied according to spatial resolution and vine phenology at the time of imaging. An image resolution corresponding approximately to row spacing resulted in the strongest correlations between berry constituents and image-based data on all occasions. Referenced to grapevine phenology, correlations were initially weak (insignificant) at bud-burst, reached maximum strength at veraison, then diminished somewhat as grapes ripened. Prospects for applying such remotely-sensed imagery (at an appropriate resolution and timing), to predict berry phenolics and colour at harvest, are discussed.||Publication Type:||Journal Article||Source of Publication:||Australian Journal of Grape and Wine Research, 10(1), p. 46-54||Publisher:||The Australian Society of Viticulture and Oenology||Place of Publication:||Glen Osmond, South Australia||ISSN:||1322-7130||Field of Research (FOR):||070604 Oenology and Viticulture||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Other Links:||http://www.pvts.net/pdfs/DiscussionGroup/Lamb1.pdf||Statistics to Oct 2018:||Visitors: 187
|Appears in Collections:||Journal Article|
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