However, at 12 noon, no difference was observed between the cultivation systems. This result was similar to that reported by MOTA et al. (2009 MOTA, C.S. et al. Water supply, solar radiation and photosynthesis in 'cabernet sauvignon' grapevines under plastic covering., Revista Brasileira de Fruticultura v.31, p.432-439, 2009. Available from