A field trial was conducted in vineyards of 'Niagara Rosada' grapevine conducted in the following trellis systems: vertical upright trellis with single cordon and the Y-shaped with plastic overhead cover in order to compare microclimatic changes in the vineyard due to the trellis system and the use plastic cover and the yield of the grapevines. It was observed that the maximum and minimum temperatures were similar in both systems evaluated. Solar radiation was attenuated by about 20% by the plastic overhead cover and 41% of outside solar radiation was transmitted to the cluster height in the Y-shaped system and 21% for the vertical upright trellis. The yield and cluster weight were higher in the Y-system with plastic overhead cover when compared to the vertical trellis system
table grape; solar radiation; trellis system; protected cultivation
