Agronomic behavior in wine grapevines in different pruning times and break dormancy

Abstract

The wine industry is a very important activity on the national scene, having important role in diversification and incorporation of income for small farms. Given the above, the aim of the present study was to evaluate pruning times associated with the use of hydrogen cyanamide for dormancy breaking into thin variety vines. ‘Cabernet Franc’, ‘Cabernet Sauvignon’, ‘Merlot’ and ‘Tannat’ in Marechal Cândido Rondon, Paraná State, Brazil. The experiment was conducted in didactic orchard located in the Experimental Station Unioeste, between June and December/2012. The experimental design was randomized blocks in factorial 3 x 4 (pruning times x cultivars). The cultivars were grafted on rootstock Paulsen1103 and pruning on July 21, August 04 and August 18, where he was then the application of hydrogen cyanamide. Evaluated in the growing season overall growth of the branches and stem diameter. At harvest, they were evaluated biomass, volume, width, length and number of clusters, biomass rachis, biomass and diameter of berries, production and productivity. Within the vegetative parameters, the ‘Merlot’ presented larger diameter stems and the Cabernet Sauvignon highest total growth of branches. The variety Cabernet Franc’ showed higher production and productivity. Early pruning showed better results for the studied cultivars.