by Astrid Buica, Aléta Bruwer & Wessel du Toit | 1 Aug, 2019 | Oenology research, Winetech Technical
In this three part series, we explore some fundamental aspects of sulphur and nitrogen foliar fertilisation and the chemical and sensory results of a recent project that took place in South Africa. Foliar fertilisation and wine aroma Vine nutrition plays a...
by Yu Gao, Melané Vivier & John Moore | Oenology research, Winetech Technical
Exploring the secret ingredients in wine enzyme mixes and cocktails. Introduction Wine grapes need to be macerated to extract juice and the key ingredients, such as pigments and tannins, in order to craft wines effectively. This is particularly important in red...
by Heinrich du Plessis, Maret du Toit, Hélène Nieuwoudt, Marieta van der Rijst, Martin Kidd & Neil Jolly | Oenology research, Winetech Technical
This study follows similar studies done by us on Chenin blanc, Chardonnay and Pinotage. The aim of this study was to determine the effect of seven different non-Saccharomyces yeast strains in combination with Saccharomyces cerevisiae and three malolactic fermentation...
by Hanno van Schalkwyk | Practical in the vineyard, Winetech Technical
The establishment of a vineyard block is a long term investment which may amount to as much as R300 000 per hectare in the case of wine grapes. A longer productive lifetime may yield bigger profits in the course of time. Furthermore, it is known that grapevines in...
by Charl Theron | Practical in the cellar, Winetech Technical
Tartaric acid is not only one of the major fixed acids in grapes, but also plays a role in the composition and taste of wine. As result of its different forms in wine it also influences the pH and cold stability of wine. The Australian Wine Research Institute (AWRI)...
by Ruben Goudriaan, Caren Jarmain, Mechteld Andriessen, Kristin Abraham, Roan Naudé & Peter Keuck | 1 Jul, 2019 | Viticulture research, Winetech Technical
In this article, the impact of the 2017-18 drought on the Western Cape agricultural sector is assessed using satellite-based data products available via FruitLook. Introduction Three dry winters in a row caused Western Cape dams to drop to record low levels....
by Yu Gao, Melané Vivier & John Moore | Oenology research, Winetech Technical
Improving consistency from the grape to the glass; from the vineyard to the wine. Introduction Vineyards are complex variable systems and perennial crops change from season to season. In any vineyard you have variability from soil and geography; you also have...
by Shaun Langenhoven, Francois Halleen, Chris Spies & Lizel Mostert | Viticulture research, Winetech Technical
The aim of this study was to evaluate the effect of different rotation crops used by nurseries on BFD and CRR pathogens by detecting and quantifying these pathogens in nursery plants and soil. Introduction Grapevine decline is a disease complex that affects...
by Carolyn Howell | Viticulture research, Winetech Technical
Carolyn went to New Zealand and Australia to participate in a technical tour focussing on the management and re-use of treated winery wastewater, with particular reference to wine grape irrigation. This article focuses on visits in Adelaide. She reports … Recently,...
by Charl Theron | Practical in the cellar, Winetech Technical
Ellagitannins are hydrolysable tannins, which do not occur naturally in grapes. It is however the tannins, which are mostly allowed as legal additives during winemaking. The ellagitannins, which occur in wine are extracted from wooden barrels or added as legal...
by Rodney Hart, Bongani Ndimba & Neil Jolly | 1 Jun, 2019 | Oenology research, Winetech Technical
During alcoholic fermentation of grape must, the metabolic activity of Saccharomyces cerevisiae leads to a range of compounds, some of which enhance tropical fruit aroma, e.g. volatile thiols. Introduction Two thiols in particular, namely 3-mercaptohexanol...
by Carolyn Howell | Viticulture research, Winetech Technical
Carolyn went to New Zealand to participate in a technical tour focussing on the management and re-use of treated winery wastewater, with particular reference to wine grape irrigation. This article focuses on the visits to industries other than wineries to see how they...
