Alterações micrometeorológicas com uso de cobertura plástica em cultivo de videira ‘Niágara rosada’

Abstract

Protected cropping is an alternative in face of seasonality and climatic adversities. Studies that evaluate different cultivation environments are important to understand the adaptive processes of plant species. This study aimed to determine changes in solar radiation and air temperature caused by the use of plastic cover in the cultivation of ‘Niágara rosada’ grape. The experiment was conducted in a family property, for two seasons, in an environment with impermeable plastic cover and in another environment without cover, where grape was grown in the trellis system. In the 2014/15 season, with less cloudiness, global solar radiation was equal to 22.4 MJ m^-2 day-¹ in the environment without cover and to 14.4 MJ m^-2 day^-1 in the environment with plastic cover. In the 2015/16 season, with great cloudiness, global solar radiation was equal to 12.9 and to 8.9 MJ m^-2 day-¹ in the environments without and with plastic cover, respectively. Minimum air temperatures were not affected by the cover, while mean and maximum temperatures were higher in the covered environment. Above the canopy, the mean air temperatures increased by more than 2.0 °C and maximum temperatures increased by more than 8.6 °C.