개화기 신초비틀기에 의한 ‘캠벨얼리’ 포도의 착립 및 과실품질
The Effect of Shoot Twist at Bloom on Fruitfulness and Fruit Quality of ‘Campbell Early’ Grapevine
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초록
본 연구는 수세가 강한 ‘캠벨얼리’를 시험재료로 착립률 증진을 위한 개화기 신초 비틀기의 효과를 규명하기 위하여 수행되었다. 수세가 강한 ‘캠벨얼리’의 신초 비틀기 처리에 따른 발아기 및 개화기는 처리별 차이가 없었으나 수확기는 3일 정도지연되었다. 신초 비틀기 처리구에서 수확기가 지연된 것은 ‘캠벨얼리’의 과방중과 착립률이 개화전 7일과 개화시 모두 3절 비틀기 처리구에서 높게 나타났기 때문이었다. 신초 비틀기에 의한 ‘캠벨얼리’의 가용성 고형물 및 산도는 처리간 차이를 보이지 않았으나, 수량은 ‘개화 전 7일 3절 비틀기’ 처리에서 12.1 ㎏ /주으로 무처리에 비하여 1.6배 증가하였다. 안토시아닌 함량은 무처리에 비하여 수량이 많은 처리구에서 낮았으나 착색도인 Hunter 값은 처리간 유의적 차이를 보이지 않았다.
Abstract
This study was conducted to investigate the effect of shoot twist on fruitfulness and fruit quality of ‘Campbell Early’ grapevine. Proper pruning and training are essential to produce a good yield of high-quality fruit and to maintain the balance between vegetative growth and fruiting. The most common problem in spur-pruned ‘Campbell Early’ cultivar is that vigorous buds has low fruitfulness and thereby the shoot become more vigorous the following spring because of lower crop load. Therefore, shoot twists in very vigorous ‘Campbell Early’ canes (above 10.0 ㎜) were performed on the third nodes and the 7 th nodes of each shoot at 7 days before bloom and full bloom, respectively. Sprouting date, blooming date were not significantly different among the treatments while, harvesting date was delayed approximately 3 days. However, number of berries per cluster, cluster weight and fruitfulness were significantly higher in the shoot twist treatment on the third nodes than the control that was topping alone. Combination treatments of shoot twist and topping had an additive effect on increasing cluster weight resulting in higher increase of yield by 12.1 ㎏ per vine. These results indicated that the shoot twist on very vigorous canes of ‘Campbell Early’ grapevine for well fruitfulness seemed to be very effective. Key words - Campbell Early, Fruitfulness, Grpaevine, Shoot twist
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