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KMID : 0903619730130010091
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Journal of the Korean Society for Horticultural Science
1973 Volume.13 No. 1 p.91 ~ p.96
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Effects of Defoliation and K - Application After Harvest on Cold Hardiness , Vine Growth and Yield of Campbell Early Grapevines
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Abstract
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Effects of K-application and artificial defoliation at various stages after harvest on the reserves of foods stored in grape canes, cold hardiness of winter buds, subsequent vine growths, fruit setting and yield were studied with 5-year-old Campbell Early grape from September 1971 till September 1972.
1. The earlier the defoliation, the less stored foods in grape vines were accumulated. reserve foods of grapevines defoliated in September were markedly decreased as compared with natural leaf-failed grape vines, but there was nat difference between natural leaf-fall and defoliation of October. It is suggested that most of carbohydrates synthesized at leaves were already translocated in canes.
2. In treatments with -15℃ in refrigerator for 2 hours, winter buds of cutting defoliated in September were not sprouted more than 40% and post-harvest K-application had no effect on cold hardiness of winter buds.
3. The buds on these canes defoliated artificially were sprouted late irregularly in the following spring. This tendency was most conspicuous in the grapevines defoliated in September. Moreover yield n-as strikingly decreased in the shoots on these canes by drop of percentage of available pollen grain and number of flowers per cluster and setting of the berries.
4. K-application after harvest did not show expected effects on cold hardiness of winter buds, translocation of stored foods, shoot growth, and fruit sitting on account of field conditions.
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