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Microclimate, yield and bunch quality of the maximo grapevine grown during the summer and winter season and submitted to different crop levels

Abstract

The rural tourism at the region of of Jundiaí and neighbour counties is increasing the offering for labor hand and the benefit for the grower through the commerce of grapes for wine purpose. However one of the problems faced by the grower is related to the occurrence of rain during the maturation-harvest period that does not favor the amount of sugar content in the berries. Now a day, technologies like crop level and extemporaneous pruning date (summer pruning) are allowing the grower from different Brazilian regions to obtain higher quality grapes for wine. However for the São Paulo State this growing system still needs more research results. Therefore a field trail will be carried on using the Máximo grapevine cultivar pruned during the winter and summer aiming to characterize: microclimatic modifications; behavior of sugar content during the growing season; yield and physical and chemical properties of the grape berries. Also a comparison of different crop levels due to bunch thinning will be done. The experimental design will be completely randomized with four replicates for each treatment (different crop level). The microclimatic measurements (solar radiation, photossintetically active radiation; air temperature and rain) will be taken by automatic weather stations outside of the vineyard and at bunch level. At harvest time the agronomic (yield) and physical and chemical characteristics (bunch size and weight, solid soluble content, pH) will the measured in order to identify bunch quality for wine purposes. (AU)

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