Effects of Fruiting on Root Growth in ‘Kyoho’ Grape (Vitis vinifera L. x V. labrusca Bailey) Cultivated With a Double Cropping System
Date Issued
2016
Date
2016
Author(s)
Huang, Kai-Yu
Abstract
Timing for root growth and root activity is important for orchard management, affecting timing of fertilization application and uptake as well as allocation of carbohydrate and nutrient in plants. Taiwan is located on subtropical region with year round warm climate, allowing a double cropping system that is distinctive from the normal system in the temperate region. Neverthless, fruit load is an important key for the double cropping system. However, root growth and activity in double cropping system has yet to be fully documented. The objective of this theiss was to assess fruiting effect on root growth of ‘Kyoho’ grape. In this study, 9-year-old self-rooted ‘Kyoho’ grapevines were planted in polypropylene containers with root observation windows. Vines were trained to a double-shoot canopy structure. Fruiting or not be treatments and investigating new root growth and development. In the summer cropping cycle, new roots growth in fruiting vines mainly occurred from bloom to verasion, and those in non- fruiting vine delayed until period from verasion to fruit harvest correlating to the phenology of fruit vines. New root remaining white, root survival, or total new roots growth index were not affected by fruiting.In the winter cropping cycle, a peak of new roots growth occurred from bloom to verasion regardless of fruiting. New root remaining white, root survival, or total new roots growth index were also not affected by fruiting. Effective root index / new root growth index and root lifespan were significantly greater in the winter croppying cycle than in the summer cropping. In conclusion, in the double cropping system, root growth patterns were different between summer and winter cropping cycle. Overall, a major root growth peak occurred the summer.
Subjects
double cropping system
peak of root growth
crop load
root lifespan
Type
thesis
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