How to handle high sugar musts

Karien O’Kennedy - 08 Mar 2017

Yeasts are living organisms and therefore have specific genetic capabilities and limitations. Here are a few guidelines on how to handle high sugar musts to increase one's chances of obtaining dry wines.

Which yeast?

Karien O’Kennedy - 08 Mar 2017

The two most important considerations for an optimal fermentation are: The yeast must have the ability to ferment to dryness in the given conditions without becoming sluggish or stuck and within the time frame required for process optimisation; and the sensory profile of the yeast must complement and promote the varietal character of the grapes. These two aspects go hand in hand. However, the yeast’s fermentation capabilities are always more important than its aromatic profile.


Yeast nutrition

Practical guidelines by: Karien O’Kennedy - 08 Mar 2017

Yeast nutrients are added to fermentation primarily to ensure the completion of fermentation and to limit the formation of sulphur-like off odours. It is a fairly common practice seeing that grape juice often contain insufficient nitrogen. This article covers some of the basic concepts of yeast nutrient management in winemaking.

Spontaneous fermentation: How to handle the new-old kid on the block

Debra Rossouw - 09 Feb 2017

Interest in spontaneous fermentation is rising in wineries across the globe. This trend has various drivers, importantly consumer preference for a perceived ‘natural’ product, financial factors (no inoculation of pricey starter cultures) and quality considerations. For winemakers considering a first foray into spontaneous fermentation, here are some helpful hints to guide you on your journey.

Management of grapevines during drought periods

IGWS - Lucinda Heyns - 05 Feb 2017

This document highlights a few practical guidelines for managing vineyards during drought conditions. Always bear in mind that these are merely guidelines and vineyard practices should be tailored to the specific area, climate, soil type and wine goal.

Image: Lucinda Heyns

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