Vine nitrogen status impacts yield, vigor, shoot growth, berry size, grape acidity, grape sugar
content, skin phenolics and grape aroma compounds.
This problem has many causes, as a consequence of grape sugars
increasing at harvest.
Vine water status was assessed for three soil types during four vintages by means of stem water potential and carbon isotope discrimination measured on grape sugar
Gallo has paid bonuses, and other wineries pay bonuses based on grape sugar
levels, or for sustainable certification.
The table on this page shows the average grape sugar
(degrees Brix) for Cabernet Sauvignon in Napa County for every year from 1971 through 2001.
15 The experiments demonstrated that the plant had bound the smoky compounds to grape sugars
(see "Uptake and Release of Smoke Taint in Grapevines" on page 61).
This process, known as mutage, arrests the fermentation and allows the wine to retain its natural sweetness from unfermented grape sugars