Effects of girdling kiwifruit trees [Actinidia deliciosa] during the growth period on vegetative growth, fruit growth and quality
2002
Moriguchi, K. (Ehime-ken. Fruit Tree Experiment Station, Matsuyama (Japan)) | Yano, T. | Shinkai, S. | Sagawa, M. | Inoue, H. | Ochi, M.
We investigated the effects of varying the time of girdling treatment and its yearly use on the trunk of kiwi fruit trees on fruit growth, fruit quality, elongation of current shoots, the following year's sprouting percentage, the next year's flower abundance, etc. The treatment consisted of one centimeter width girdling of the trunk 4 times every 7 days. 1) Fruit growth was excellent when the girdling treatment was done in the middle and latter half of July. This effect became more significant for the current year's treatment, after repeated yearly treatments. 2) The percentage of large size fruit was higher on girdled trees than on controls. The earlier the girdling treatment was done, the larger the fruit. The yearly treatment exhibited more significant effects on the growth of fruit than the single year treatment. 3) The Brix was higher for fruit from girdled trees both at harvest and after ripening. The later the treatment was performed, the higher the Brix became. 4) The sprouting percentage, number of flowers per last year's shoot, and number of flowers per bearing shoot were not significantly different between a single year treatment and yearly treatment. More than 100 flowers per square m were preserved. The early elongation of the current shoot in the year after treatment was less if the treatment was performed. 5) The starch content in the root in August and September was lower in trees that were treated yearly compared to those that were not treated. The starch content partially recovered by the resting period. 6) The extent of maturation and storability of fruits were not significantly different between girdled and control trees.
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