Development of models for predicting phenology and evolution of maturity in cv. Cabernet Sauvignon and Chardonnay grapevines

A study was carried out to develop predictive models for phenology and evolution of maturity in wine grapes ( Vitis vinifera ), in a vineyard located in the "La Oriental" farm in the Talca Region (35º 27' S lat. and 71º 37' W long.) during the 1998/99 growing season. To this end,...

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Bibliographic Details
Published in:Agricultura técnica 2002-11, Vol.62 (1)
Main Authors: Ortega-Farias, Samuel O, Lozano D, Pedro, Moreno, Yerko, Leon, Lorenzo (Talca Univ., (Chile). Fac. de Ciencias Agrarias)
Format: Article
Language:Spanish
Subjects:
FENOLOGIA
FORECASTING
MADURACION
MATURATION
MODELE
MODELOS
PHENOLOGIE
PHENOLOGY
RAISIN DE CUVE
soluble solids, total acidity, degree-days, pH, Vitis vinifera
sólidos solubles, acidez total, gradosdías, pH, Vitis vinifera
TECHNIQUE DE PREVISION
TECNICAS DE PREDICCION
TEMPERATURA
TEMPERATURE
UVAS PARA VINO
VARIEDADES
VARIETE
VARIETIES
VITIS VINIFERA
WINE GRAPES
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Summary:A study was carried out to develop predictive models for phenology and evolution of maturity in wine grapes ( Vitis vinifera ), in a vineyard located in the "La Oriental" farm in the Talca Region (35º 27' S lat. and 71º 37' W long.) during the 1998/99 growing season. To this end, measurements were made of the number of leaves, length of buds, diameter of berries, soluble solids (SS), total acidity (AT) and pH for grapevines cv. Cabernet Sauvignon and Chardonnay. To develop the prediction models for phenology, soluble solids, and pH as a function of the accumulated degree-days (base temperature = 10ºC), Mitscherlich's monomolecular equation, which assumes continuous growth, was used. In the case of the total acidity model, an exponential equation with a negative slope was used. The results of this investigation indicated that the use of accumulated degree-days could be a good tool to estimate phenological events and the evolution of maturity in Cabernet Sauvignon and Chardonnay cultivars. In this respect, the predictive models for phenology, soluble solids and total acidity had coefficients of determination (R 2 ) greater than 0.88. The lower correlation was found in the pH model for Cabernet Sauvignon (R 2 =0.71). Se realizó un estudio para desarrollar modelos predictivos de fenología y evolución de madurez en vid para vino ( Vitis vinifera ), en un viñedo ubicado en el fundo "La Oriental"" (35º27' lat. Sur y 71º37' long. Oeste) provincia de Talca, Chile, durante la temporada 1998/99. Para esto se efectuaron mediciones del número de hojas, largo de brotes, diámetro de bayas, sólidos solubles, acidez total y pH en los cultivares Cabernet Sauvignon y Chardonnay. Para desarrollar los modelos predictivos de fenología, sólidos solubles, y pH, en función de los grados día acumulados (temperatura base = 10 ° C), se utilizó la ecuación monomolecular de Mitscherlich, la cual asume que el crecimiento es continuo. En el caso de los modelos para la acidez total se utilizó una ecuación de tipo exponencial con pendiente negativa. Los resultados de esta investigación indicaron que el uso de los grados días acumulados puede ser una buena herramienta para estimar los eventos fenológicos y la evolución de la madurez en los cultivares Cabernet Sauvignon y Chardonnay. Al respecto, los modelos predictivos de la fenología, sólidos solubles y acidez total presentaron un R 2 superior a 0,88. La correlación más baja fue encontrada en el modelo de pH para el cultivar Cabernet Sauvi
ISSN:0365-2807