Abstract
Knowledge of fruit phenology is important to grape growers and wine makers for proper crop handling and production of best quality wines. The objective of this study was to evaluate the behaviour of grape phenological stages, evaluating some physiochemical parameters of the clonal variety Pinot Noir, cultivated under conditions of cold tropical climate at Loma de Puntalarga in Nobsa, Boyaca. For this purpose 51 plants were taken at random. Weekly three bunches (one per plant) were harvested, 20 fruits per bunch were selected randomly from day 28 on after anthesis (dda) up to the fruits total development (140dda). During this time physical and chemical parameters were determined. The fresh and dry weight followed a double sigmoid curve, where the herbaceous phase lasted 63 days, the veraison 14, maturing 42 days and over maturing 21. The pH, soluble solids and the maturity index increased with the fruit development, while the total acidity decreased. Harvesting should be carried out at 126dda, since at this moment the balance between soluble solids and total acidity is suitable for making quality wines, also at this time, the loss of fresh and dry mass by over maturing is minimal, which benefits both the wine and the grape producer.
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