ISHS Acta Horticulturae 1150: VIII International Symposium on Irrigation of Horticultural Crops
Effects of applied water amounts and trellis/training system on grapevine water relations, berry characteristics, productivity and wine composition of ‘Cabernet Sauvignon’ |
| Authors: | L.E. Williams, H. Heymann |
| Keywords: | 'Cabernet Sauvignon', irrigation, trellis systems, leaf water potential |
| DOI: | 10.17660/ActaHortic.2017.1150.58 |
| Abstract:
A study was conducted across three growing seasons (2001, 2002 and 2003) in a 'Cabernet Sauvignon' vineyard located in the Livermore Valley of California to determine the interaction of irrigation amount and trellis system on vine water relations, berry characteristics and productivity. Two trellis/training systems were used; vertical shoot positioning (VSP) trellis and a vertically split canopy (Scott Henry), where the shoots are positioned both upward and downward. The irrigation amounts were various fractions (0.375, 0.56, 0.75 and 1.12) of estimated vineyard evapotranspiration (ETc). The crop coefficients used were specific for each trellis/training system on a 1.83 m row spacing. Irrigation amounts had a significant effect on vine water status. There were only minor differences in midday leaf water potential between the two trellises for a specific irrigation treatment throughout the season. Both irrigation amount and trellis type affected berry weight, soluble solids and yield. Yield was greater for the Scott-Henry trellis compared to the VSP and yields for both increased as applied water increased. There was a significant interaction between irrigation amount and trellis for juice pH and titratable acidity. Berry anthocyanins in 2001 and 2002 were greater as applied water decreased but they were higher for the VSP compared to the Scott Henry trellis in 2001 but not 2002. There were little differences in total phenols, tannins and anthocyanins of wines made in 2002 among the treatments. Sensory evaluation of the wines detected no significant differences among the three lowest irrigation treatments. The results indicate that irrigation management can be used to maximize yields while canopy management practices and/or trellis/training systems can be used to optimize berry and wine quality. | |
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