Americas. South America is considered

the center of great diversity. Nowadays, more than 3.200 bromeliads species are known, with 70 % of the genus and more than 40 % of the species occurring in Brazil (Grant & Zijlstra, 1998), inhabiting all parts of the country, but having the Atlantic coast as the largest diversity center (Paula, 2001). The different bromeliads genera require different light intensities to their full development. The optimal climatic conditions for each species of bromeliad are those predominant in the center of origin, which determine the degree of shading for them (Carvalho et al., 1998; Carvalho & Rocha, 1999). Therefore, for growing bromeliads in a commercial scale is important that the environment could be adapted according to their climatic requirements. The bromeliads are one of the main ornamental plants cultivated in greenhouses. Considering that microclimate inside greenhouses can be modified and controlled (Medeiros, 2002), suitable conditions for bromeliads growth can be generated and the shading screens have been used for this purpose. Thus, the knowledge of the actual solar radiation transmissivity of the cover materials is of crucial importance for a better production in greenhouses. This is possible only by applying the results from the field experiments which indicate how good shading can be for producing a given plant or crop. For Cermeño (1994), the sunshine is important for all plants ’ metabolic processes. Specific advantages can be obtained with the use of different shading screens, with special optical properties, which can modify the composition of the light spectrum that reaches the plants, improving the yield and quality of them (Oren-Shamir et al., 2001). Shading can result in a positive effect on the quality and homogeneity of production (Briassoulis et al., 2007), HOLCMAN E; SENTELHAS PC. 2013. Bromeliads production in greenhouses associated to different shading screens. Horticultura Brasileira 31: 386-391. Bromeliads production in greenhouses associated to different shading screen