video 7.docx - Lecture 7 \u2013 veraison and harvest More detail about the ripening itself Avg rape harvest \u2013 mid August \u2013 late November Harvest date

video 7.docx - Lecture 7 – veraison and harvest More...

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Lecture 7 – veraison and harvest - More detail about the ripening itself - Avg rape harvest – mid August – late November - Harvest date is determined by the ripeness of the grape as measured by sugar, acid, and tannin levels with the grape - Winemakers also base their decision to pick based on the style of wine they wish to produce it changes throughout the season - If one change entirely different wine from the same grapes - In general: - when talking about growing grapes – they “grow” – wakes up in spring, turn into shoots, flowers, pollination, grapes with seeds circle of life - Sugars – convert through sun to the energy for the plant - Not simply about the leaf making sugar - Grapes undergo more changes than just adding sugar veraison – ripening period, (july or August), represents the transition from berry growth to berry ripening (the plant is chemically changing the grapes) - 1. Colors of the grape take form: red/black, yellow/green depending on the grape varieties (up to that point everything just green) - 2. Berries start to soften as they build up sugars, mostly organic acids up to this point increasingly happens - 3. The berries begin to grow dramatically as they accumulate glucose and fructose - 4. pH increases as acids (mostly malic acid) decrease – become more basic - Main acids: tartaric and malic - Tartaric acid remain about the same throughout veraison and the harvest season - Malic acids are burned up during respiration throughout the ripening/harvest season - At the end of the ripening period the level of acids is lower - As these grapes are growing – as the length increases (longer ripening period), everything is right, higher level of sugar more alcohol in the finished wine (yeast are gonna eat the
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sugar) - Color and tannic components increase as well with the length of the season (the more
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