Some observation on growing of 'Aizumisirazu' Japanese persimmon [Diospyros kaki] with reference to diagnosis of tree appearance and behavior
1999
Kikuchi, H. (Fukushima-ken. Fruit Tree Experiment Station (Japan)) | Saito, Y.
In order to establish a methods of diagnosing tree appearance and behavior for continuously favorable production of high quality fruit, some charactor of tree growth and fruit composition were investigated using 'Aizumisirazu' Japanese persimmon (Diospyros kaki L.) over a Period of 5 years from 1989 to 1994. 1. The optimum ranges of tree growth for production of high-quality fruits were noted as follows:fruiting shoot being 25 to 30 cm in length, terminal shoot was 25 to 30 cm in length, ratio of terminal shoot to fruiting shoot being 1.1 to 1.2, leaf at 7 days after full bloom was 13 cm long by 18 cm wide, leaf color reading at 7 days after full bloom being -18.5 to -19.0 (SPAD), and the percentage of shoot stopped just before blooming period being more than 80%. 2. The color of leaf at blooming period coincided fairly with that of the color chart for rice. 3. The Intensity of skin color in fruit apex correlated positively with soluble solids content (Brix) in the flesh. Therefore, it seemed possible to estimate the Brix by measuring skin color. 4. The tone of color in the color chart for the variety 'Hiratanenashi' did not correspond to the skin color of 'Aizumisirazu', thus indicating that development of the color chart for Aizumisirazu was needed. 5. The Brix value, when measured with and without the addition of polyethylene glycol, was used as a reliable index for estimating the amount of tannin in the fruit juice. 6. The percentage of light penetrated into the interior of tree canopy, required for,production of high quality fruit seemed to be more than 17%
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