Effects of drip irrigation, film sheet mulching and gibberellin application on fruit quality and splitting of 'Kanpei' fruit
2018
Kikuchi, T. | Inoue, H. | Ochi, H.
'Kanpei' is the original citrus variety bred in Ehime prefecture. The fruit have an excellent taste and unique crisp texture but it is very difficult to produce such delicious fruit because of its alternate bearing and fruit splitting. As the production is increased, problems such as unevenness of fruit quality have been obvious. Reduction in fruit splitting and alternate bearing and improvement of fruit quality were investigated. 1. The high quality (Brix) fruit was produced in outer and upper layers of tree canopy. Thus, fruit bearing around on surface of tree canopy is effective for high quality fruit production. 2. Rind coloration of stem end part of fruit was correlated with sugar content. It seems that the color change of this portion is an indication for fruit harvest.. 3. Judging from the annual data about fruit production and quality, the appropriate ratio of leaf to fruit is about 100. 4. For reducing fruit splitting from August to September, keeping consistent soil moisture was effective by such treatment as drip irrigation, mulching to avoid evaporation from soil, and soil amelioration to add field moisture capacity. 5. Gibberellin applications to young fruit from June to August were effective to reduce the fruit splitting from August to September 6. Mulching with light refractive and porous plastic sheet from September to October until harvest was effective to keep moderate soil moisture and reflection to the canopy resulting in quality fruit production.
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