Abstract

ALMANZA MERCHAN, Pedro José; GONZALEZ-ALMANZA, Sergio Danilo  and  BALAGUERA LOPEZ, Helber Enrique. Leaf position and its effect on quality and yield of the grapevine fruit (Vitis vinifera L.) 'Riesling x Silvaner' . rev.colomb.cienc.hortic. [online]. 2012, vol.6, n.1, pp.9-18. ISSN 2011-2173.

In Boyacá, grapes have been grown for winemaking for the past 29 years. The development of the leaves during growth is essential for the interception of light, the photosynthetic process and the control of the yield of dry matter. However, leaves are also responsible for the generation of shadow within the plants, which can decrease yield and quality of the berries. The objective of this research was to evaluate the effect of leaf position of grapevines (Vitis vinifera L.) 'Riesling x Silvaner', on quality components and berry yield. A completely randomized design was used with a factorial arrangement of 4 × 3; the first factor corresponded to the phenological stages of the fruit (herbaceous, veraison, maturation and harvest) and the second to the location of the leaf on the branch (leaves 4, 5 and 6). The results showed that total soluble solids (TSS) increased with fruit development, being higher at harvest; in this stage, leaf 6 favored greater accumulation of TSS. The fresh and dry mass of the fruit were higher as the state of development of the berries advanced; it was observed that leaf 6 in any state of development resulted in greater fresh weight of the berries, while for dry mass, the leaf position had no significant effect. As a result, leaf 6 is considered as having a favorable effect on yield and fruit quality of the grape 'Riesling x Silvaner'.

Keywords : herbaceous; veraison; maturation; harvest.

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