Reducing the Sugar and pH of the Grape (Vitis vinifera L. cvs. ‘Grenache’ and ‘Tempranillo’) Through a Single Shoot Trimming
Abstract
Many vineyards all over the world can easily produce high potential alcohol levels, but the importanceof the sugar content in berries has been changing over the past few years. The objective of this work was
to reduce the sugar and pH of the grapes, delay berry ripening by decreasing the ratio between the leaf
area and yield, perform an intense trimming treatment after berry set and establish the consequences for
grapevine productivity in the following year. Severe shoot trimming was done over a three-year period
(2010 to 2012). Phenological, vegetative and productive parameters were examined. The date of véraison
was delayed by about 20 days. On the same harvesting date, the trim treatment had lower soluble solids
(12% to 15 % reduction), lower pH (0.1 to 0.3) and a lower total anthocyanin content (10% reduction). The
trim effect was also reflected in berry weight; as a consequence, bunch size and yield were also reduced by
around 10%. If the trim treatment does not reduce the leaf area to fruit ratio below 0.50 m2/kg, there is no
negative impact on vine capacity in the next year.
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