02258naa a2200277 a 450000100080000000500110000800800410001910000160006024500910007626000090016752014820017665000080165865000160166665300250168265300310170765300150173865300100175365300260176365300190178965300190180865300130182770000210184070000260186170000200188777300730190720843452019-04-30       2017    bl uuuu     u00u1 u    #d1 aHOLCMAN, E.  aVineyard microclimate and yield under different plastic covers.h[electronic resource]  c2017  aThe use of plastic cover in vineyards minimizes effects of adverse weather conditions. The northwest of São Paulo State is one of the largest grape producing regions in Brazil; however, few studies investigate the effects of different plastic covers on vineyards in this region. This study compared the effect of black shading screen (BSS) and braided polypropylene film (BPF) on BRS Morena vineyard microclimate, grown on an overhead trellis system in the northwestern São Paulo. The experiments were carried out during three growing seasons (2012 ? 2014). BSS allowed superior incoming solar radiation (SR) transmissivity, resulting in higher net radiation (Rn), and higher ratio between photosynthetically active (PAR) and SR. No differences were observed between the average air temperatures (T) and relative humidity (RH) of covered environments (BPF and BSS) and outside condition (automatic weather station ? AWS), due to high air circulation, despite wind speed (WS) reduction caused by plastic covers. BPF provided better conditions for vineyard growth with higher fruit yield than vineyard under BSS regarding the number of shoots with bunches per plant, bunch and stem weights, longitudinal diameter of berries, quantity of fertile buds per shoot, and yield per shoot and per plant. BPF covers also influenced leaf size and growth speed of plants in vineyards. Keywords Black shading screen . Braided polypropylene film . BRS Morena . Leaf wetness duration . Yield  aUva  aViticultura  aBlack shading screen  aBraided polypropylene film  aBRS Morena  aGrape  aLeaf wetness duration  aPlastic covers  aUvas do Brasil  aVineyard1 aSENTELHAS, P. C.1 aCONCEIÇÃO, M. A. F.1 aCOUTO, H. T. Z.  tInternational Journal of Biometeorology, [online] p. 1-13, May 2017.