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Seon-Kyu Kim and Dong-Yong Choi

All possible grafting combinations of seven roostock s and six scion cultivars were made to evaluate the rootstock/scion compatibility in grapevine nursery production. Percentage of takes was variable from 20.5%(Uni Blanc/161-49 C.) to 87.3%(K 188-2/161-49 C). Among scion cultivars, mean percentage of takes varied from 82.5%(K 188-2) to 37.5%(Ugni Blanc) while roostocks with all scion cultivars varied from 69.9%(R 110) to 52.8%(101-14 Mgt.), indicating the greater effects of scion on percentage of takes. Variation in rooting index(0: none to 4:profuse rooting scale) was from 3.48(SV 5276/Rip. Gloire). 3.49(Neo Muscat/101-14 Mgt.) to 1.63(SV 5276/161-49 C). Mean rooting index of rootstocks with all scion cultivars varied from 3.10(101-14 Mgt.) to 1.95(161-49 C.) while that of scion cultivars varied from 3.07(SV 5276) to 2.44(Ugni Blanc). In rooted grafting, rootstock had a greater effect than scion cultivars.

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Dong-Yong Choi and Seon-Kyu Kim

Two training systems(open lyre and Kniffin) with two planting densities(3.3 m × 1.5-1.1 m and 1.8 m × 1.5-1.1 m, R × V, respectively) were evaluated for their effects on growth, yield, and fruit quality of fourteen grapes grafted to SO4. Cane pruning weights of vines grafted to SO4 rootstocks averaged 268.1 kg/10a. Chenin Blanc, Cabernet Sauvignon, and Clairette grapes had greater cane pruning weights. Pruning weights of vines trained to the Kniffin system with 1.8 m × 1.1 m spacing were greater. Fruit yields of young vines averaged 438.6 kg/10a, and SV 5276, Carignane, and Ugni Blanc grapes were more productive while Riesling, Grenache, Chenin Blanc, Muscat de Frontignan grapes were less productive. Yields of grapevines trained to the Kniffin system with 1.8 m × 1.1 m spacing were more productive. Fruit quality was less affected by training system and planting density, but significant varietal differences were recognized.

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In-Chang Son, Jae-Hyuk Park and Seon-Kyu Kim*

Three-year-old `Campbell Early' grapevines were subjected to 4 levels of shading (0, 30, 60, and 90%) combined with 3 levels of soil moisture content (12, 34.6, and 100 kPa), and their growth responses were examined. Increase in shoot length of vines grown without soil water stress (12 kPa and 34.6 kPa) and light stress (non-shading and 30% shading) was higher than those grown under 100 kPa and heavy shading. Leaf number showed a gradual increase in proportion to decreasing shading and increasing light level, showing some overgrowth with 30% shading. Leaf area increment of vines with sufficient soil moisture (12 kPa) was the highest, but 30% shading reduced the rate by one half. Chlorophyll content of vine leaves grown under 12 kPa or 34.6 kPa increased regardless of shading level, but that of 30% shading became more important after 30 days. The qP and qN values of vines grown under 12 kPa and 34.6 kPa decreased with the shading level, and under 100 kPa, even non-shading vines showed a drastic decrease. When grown under 12 kPa, photosynthetic rate of non-shaded vines was higher than shaded vines, but when water-stressed, that of non-shaded vines showed a sharp decrease. Increasing shading and water stress level resulted in decrease of sucrose and starch content and increase of reducing sugar.