We investigated the differences in fruit quality between gibberellin-treated and untreated berries of 'Kyoho' (Vitis labrusca L. × V. vinifera L.) grapes under the same fruit load. Although coloring of the seedless berries occurred earlier than in seeded berries, the increase in the skin color and soluble solids content (SSC) of seeded berries was superior to that of seedless berries after coloring. At the harvest time, the SSC of seedless berries was lower, but the skin color index changed from year to year. The skin color index and SSC of seedless berries decreased on the same shoot, and the skin color index of seedless berries decreased on the same cluster during the growing season. In addition, the skin color index and SSC decreased with an increase in the fruit cluster weight.
Effects of different first bearing years (3, 4, or 5 years after planting) on the tree growth, yield and fruit quality of satsuma mandarin (Citrus unshiu Marcow. cv. 'Otsu-No. 4') trees grafted on dwarf rootstock 'Hiryu' (Poncirus trifoliata (L.) Raf. var. monstrosa) were investigated. No relationship was found between the first bearing age and fruit quality. The later the first bearing, the larger the canopy volume became, however, trees that began to bear from 5 years after planting were large and higher alternate bearers. On the other hand, trees that began to bear from at 3 years after planting showed less growth and production. In consequence, trees that began to bear from 4 years after planting (tree height 172 cm, canopy volume 3.2 m 3) had the best productivity and work efficiency.
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