Bud fertility was estimated in two commercial vineyards of Vitis vinifera cv. Tannat in the southern region of Uruguay; it was carried out in two periods: 1983-1986 (essay A) and 2001,2002,2003 (essay B). The information about bud fertility and yield obtained in the essay A was used as a historical series. The essay B begun in the year 2001. In the two essays, two pruning systems were evaluated: Guyot and cordon de Royat.
The pruning system has a very important influence on the bud fertility and therefore on the yield. The Guyot type of pruning, showed for all the years involved in the essay a tendency to higher yields, if it is compared to the Cordon de Royat type of pruning.
The study of the bud fertility, yield and the pruning type for a vineyard during a number of years, can be used as a tool to predict the harvest volume.
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