Climatic Variables and Their Effects on Phenolic Maturation and Potassium Uptake in Cabernet Sauvignon Wines

The aimed at identifying and understanding the relationships of phenolic maturation and potassium uptake dynamics jointly with climatic variables for Cabernet Sauvignon variety. The experiment was carried out in Dom Pedrito, Rio Grande do Sul-Brazil, in the 2016 growing season. The experimental design was randomized blocks with treatments arranged in three replicates. The physical-chemical characteristics were measured: Density, Glucometric degree, Hydrogen ionic potential, Titratable Total Acidity, Total polyphenol index, Potassium, Phenolic maturity index. The periods preceding grapes phenolic maturation directly influence the physical and chemical conformity of must and wine. Potassium, pH and total acidity directly influence the poor phenolic maturation of Cabernet Sauvignon. Minimum and maximum air temperature, thermal amplitude, incident solar radiation and accumulated rainfall interfere in the photosynthetic dynamics, potassium accumulation in the grapes and phenolic maturation of Cabernet Sauvignon.