Fruit Research Division, National Institute of Horticultural & Herbal Science1
Technology Service Division, National Institute of Horticultural & Herbal Science2
Planning and Coordination Division, National Institute of Horticultural & Herbal Science3
Agricultural Research Center for Climate Change, National Institute of Horticultural & Herbal Science4
Trellising is an important cultural practice that affects grape quality and yield. Some grape cultivars require different trellising under different climate and soil conditions. To find suitable trellis conditions for grape cultivar ‘Cheongsoo’, we measured growth and fruit characteristics with three different trellis systems: curtain, Geneva double curtain (GDC), and modified T. The maximum light exposure of clusters in the curtain, GDC, modified T trellis systems was 670, 1,654, and 1,649 μmol･m-2･s-1, respectively. However, there was no difference in air temperature among the three trellis systems. Net CO2 assimilation rate at 1,500 μmol･m-2･s-1 light intensity was 13.4, 13.7, and 8.7 μmol･m-2･s-1 in curtain, GDC, and modified T trellis systems, respectively. Trunk cross section area (TCSA) and bud burst rate were not significantly different among the three systems. Shoot number was 31.3, 47.0, and 37.0 in curtain, GDC, and modified T trellis systems, respectively. The shoot length was higher (243.9 cm) in the modified T trellis system than in the single curtain (171.1 cm) and GDC (151.5 cm) systems. Interior leaf number and leaf layer number were higher in the GDC system, in which there are two primary branches, in comparison to the modified T and curtain systems, which utilize one primary branch. Primary leaf area and lateral leaf area were significantly higher in the modified T trellis system in comparison to the GDC system. Berry weight, length and diameter, and total soluble solids were not significantly different among the three trellis systems. However, cluster weight and cluster number per tree were significantly higher in GDC. Titratable acidity was significantly lower in GDC. Collectively, our data suggest that the GDC trellis system is preferable for grape ‘Cheongsoo’ to maintain fruit quality and quantity in Korea.
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