O sombreamento como técnica de monda de flores e bagos nas cultivares de uva de mesa "Sugraone" e "Crimson seedless"

Mestrado em Engenharia Agronómica - Instituto Superior de AgronomiaExcessive berry set reduces cluster quality in table grapes. In this trial, it was evaluated a new technique to reduce berry set, by decreasing about 70% the light intensity. The study was conducted in two seedless cultivars, Sugraone and Crimson Seedless, and consisted in three treatments: application of 1 ppm of gibberellic acid at the end of bloom; application of an artificial net over the plants, at the same timing, for 7 days on Sugraone and 14 days in Crimson; and a control, where no berry thinning method was conducted at bloom. The number of flowers and berries drop was counted. Net photosynthesis, transpiration and stomatal conductance were recorded, during and after shading, and berries diameter was measured. At harvest, yields were recorded and quality parameters were analyzed. In general, there were no significant differences in cumulative fall of flowers and berries between treatments. Despite the reduction in photosynthesis, during the shadow, the diameter of berries of the shade treatment was similar to the other treatments. Shade treatment in Crimson Seedless led to less compact clusters