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Physicochemical effects of different pruning techniques and different amounts of Municipal Solid Waste compost on Sauvignon blanc wines in Quinta do Gradil (Lisbon Wine Region)
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Resumo(s)
The aim of this work is to analyze the effects of the mechanical pruning technique and the use of municipal solid waste compost in Sauvignon blanc wines.
For this reason, the experimental vineyard was divided into four blocks, in which the different treatments were used for two consecutive years and a strip-plot experimental design was used.
The vinification was a classical white vinification and the alcoholic fermentation took place in 50L stainless steel vats. At the end of the fermentation a correction to 35mg/L of free sulphur dioxide was made before the bottling of the wines.
Subsequently, the wines were analysed basing on physico-chemical parameters, phenolic composition and chromatic characteristics to assess the effects of the different treatments.
In general, as for the pruning technique, it is possible to say that mechanical pruning led to higher hue values for the wines of 2018 and higher values of clarity for the wines of 2019.
At the same time, mechanical pruning led to a lower 420nm absorbance values in wines from 2019 vintage and it corresponds to a lower yellow colour of the wine.
In any case, all the underlined differences on the final wines were not visible to the naked eye.
The effect of the use of municipal solid waste compost on wine quality is not so clear, the results depend on each vineyard and more detailed analysis must be carried on. For example, the possible heavy metals phytotossicity from municipal solid waste compost must be analysed
Descrição
Mestrado em Engenharia de Viticultura e Enologia (Double degree) / Instituto Superior de Agronomia. Universidade de Lisboa / Faculdade de Ciências. Universidade do Porto
Palavras-chave
Wine Sauvignon blanc Municipal Solid Waste Compost mechanical pruning manual pruning
Contexto Educativo
Citação
Liggio, A. - Physicochemical effects of different pruning techniques and different amounts of Municipal Solid Waste compost on Sauvignon blanc wines in Quinta do Gradil (Lisbon Wine Region). Lisboa: ISA, 2020, 70 p.