Effects of leaf-to-fruit ratio on fruit quality and fruit setting in the following season on container-grown root system of satsuma mandarin
2000
Sawano, I. (Shizuoka-ken. Citrus Experiment Station, Shimizu (Japan)) | Sasaki, T. | Suzuki, T.
The effects of different leaf-to-fruit ratios on fruit quality and fruit setting in the following season were investigated on a container-grown root system of satsuma mandarin (Citrus unshiu Marc.) cv. 'Aoshima Unshu' and cv. 'Takabayashi Wase'. 1) The average fruit diameter increased with increasing leaf-to-fruit ratio. Based on the value of 30 leaves per fruit, fruit size of 'Aoshima Unshu' was within L-class while the fruit of Takabayashi Wase' was M-class. 2) In 'Takabayashi Wase', sugar and acid content in the juice increased with decreasing leaf fruit ratio. But in 'Aoshima Unshu', this relationship was not evident. 3) The fruit setting in the following season increased with increasing leaf-to-fruit ratio. In the thinning-fruit tree of 30 leaves per fruit, the number of leaves per fruit in the following season calculated by regression formula was 19 for 'Takabayashi Wase' and 46 for 'Aoshima Unshu'. 4) The generally accepted method of fruit thinning (30 leaves per fruit) was applied to 'Takabayashi Wase' but was not to 'Aoshima Unshu'. In the container-grown root system of satsuma mandarin cv. 'Aoshima Unshu', the effects of crop load on flower bud formation and fruit setting of the next year were probably greater than those of root confinement and water stress
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