The Application of Remote Sensing Technology in Terroir Studies

Project Number
VE OR 01

Project title
The Application of Remote Sensing Technology in Terroir Studies

Project leader
Strever, A E

Institution
University of Stellenbosch. Department of AgriSciences. Department of Viticulture and Oenology

Project description
This project was launched to supply processed digital multispectral imagery of a selection of plots from project WW 13-12, with the main aim being the selection of experimental plots best representing the natural terroir units studied. Moreover, two additional plots of higher and lower vigour respectively were also selected at each site to study links between vine and grape characteristics under these differing conditions.

Results obtained and research questions generated from this project led to the initiation of two other projects in January 2006 (WW-AS1 and WW-AS2) focussing on the yield x ripeness x vigour interactions as well as vine vigour x water status interactions.

The major benefits reached to date in this project include:
1. Ensuring the optimal placement of the three experimental sites selected within study blocks of project WW13-12.
2. Monitoring grapevine reaction to variable soil conditions.
3. Minimisation of statistical variance through optimal placement of experimental sites and improved knowledge on within-plot variability (between the three ‘medium’ vigour plots).
4. Generating spatial data that can be used in future to use remote sensing images for improved vineyard management, with a specific focus on pruning practices, canopy management and water stress management practices (combined results from three mentioned projects).
5. Highlighting to industry the inadequacy of basing decisions of vineyard management on limited point data or observations in vineyards.

Poster(s)
Coetzee, Z A, Carey, V A and Strever, A E. 2005. Quantification of vigour: A correlation between remote sensing and field measurements. Poster presented at the 3rd International Congress of the South African Society for Enology and Viticulture. 7-8 November, Cape Town, South Africa.

Schutte, J C, Coetzee, Z A, Strever, A E and Carey, V A. 2005. Investigating multispectral image calibration using field measurements of vine vigour for the purpose of spatial and temporal comparisons with vineyards. Poster presented at the 3rd International Congress of the South African Society for Enology and Viticulture. 7-8 November, Cape Town, South Africa.

Presentation(s)
Strever, A E. 2003. A study of with-in variability using remote sensing and conventional measurement techniques. Paper presented at the 26th National Congress of the South African Society for Enology and Viticulture. 13-15 November, Somerset West, South Africa.

Strever, A E. 2003. Current South African research on remote sensing in viticulture at the University of Stellenbosch. Presentation at the Precision Viticulture Workshop. January, Stellenbosch, South Africa.

Strever, A E. 2003. Multi-spectral vineyard vigour variability assessment for targeted optimum ripeness determination. Paper presented at the 27th National Congress of the South African Society for Enology and Viticulture. 5-7 November, Somerset West, South Africa.

Strever, A E. 2003. The assessment of within vineyard vigour variability at the University of Stellenbosch. Paper presented at the 27th National Congress of South African Congress for Enology and Viticulture. 5-7 November, Somerset West, South Africa.

Strever, A E. 2004. Assessing and managing within vineyard variability in South Africa, a tool for research and practice. Paper presented at the 12th Australian Wine Industry Technical Conference. 24-29 July, Melbourne, Australia.

Strever, A E, Joubert, D A and Young, P R. 2004. Non-destructive leaf chlorophyll assessment in Vitis vinifera (cv Cabernet Sauvignon). Paper presented at the 12th Australian Wine Industry Technical Conference. 24-29 July, Melbourne, Australia.

Strever, A E. 2004. The use of remote sensing in South African terroir. Paper presented at the 5th Joint International Conference on Viticultural Zoning and the 28th National Congress of the South African Society for Enology and Viticulture. 15-19 November 2004; Cape Town, South Africa.

Carey, V A, Archer, E, Barbeau, G, Saayman, D and Strever, A E, 2005. The use of local knowledge relating to vineyard performance to identify viticultural terroirs in Stellenbosch and surrounds. Paper presented at the International Workshop on Advances in Grapevine and Wine Research. 15-17 September, Venosa, Italy.

Shange, P, Carey, V A, Fey, M V and Strever, A E. 2006. The challenge of ‘heuweltjies’ soil for viticulture in the south Western Cape. Paper presented at the 29th World Congress of Vine and Wine and the 4th General Assembly of the OIV. 25-30 June 2006, Logrono, Spain.

Strever, A E. 2005. Investigating the effects of vine vigour variability on the source:sink balance of vines and possible impact on vine water status modelling. Paper presented at the 3rd International Congress of the South African Society for Enology and Viticulture. 7-8 July, Cape Town, South Africa.

Strever, A E, Potgieter, E and Young, P R. 2008. A study of vine pigmentation reaction to water stress with the incorporation of conventional as well as hyper-spectral measurement techniques. Paper presented at the 59th Meeting of the American Society for Enology and Viticulture. 17-20 June, Oregon, United States.

Article
Strever, A E. 2003. How to manage vineyards precisely, WineLand, Mnth Aug (p. 92-95)

Strever, A E. 2007. The use of local knowledge relating to vineyard performance to identify viticultural terroirs in Stellenbosch and surrounds, Acta Horticulturae, (754) (p. 385-392)

Strever, A E. 2007. Remote sensing as a tool for viticultural research in South Africa with specific reference to terroir studies, Acta Horticulturae, (754) (p. 393-400)

Smit, J L, Sithole, G, Strever, A E. 2010. Vine signal extraction – an application of remote sensing in precision viticulture, South African Journal of Enology and Viticulture, v. 31 (2) (p. 65-74)
Article.pdf

Paper
Strever, A E. 2005. Estimating water status of Vitis vinifera L. using field spectrometry: A preliminary study incorporating multispectral vigour classification, IN: Proceedings of Frutic 05: Information and Technology for Sustainable Fruit and Vegetable Production. (p. 269-278) 12-16 September,

FinalReport.pdf

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