Characteristics on blooming, bearing and fruit growth of Citrus cv. Amakusa cultivated in greenhouse
2007
Ikeda, S.(Saga-ken. Fruit Tree Experiment Station, Ogi (Japan)) | Matsumoto, A. | Shindo, T. | Hirano, T. | Shinokura, K.
Characteristics on blooming, bearing and fruit growth of Citrus cv. Amakusa cultivated in greenhouse were described to produce high quality fruit. More fruits on the inflorescence with leaves readily set than on leafless inflorescence in the greenhouse. The flower-bearing shoots sprouted well from previous spring and summer flush. The stable fruit yield of 40-50 tons per ha could be expected in continuous years by the management of suitable flower-bearing shoots. The penetration of water following the rainfall after the removal of vinyl film coverage lowered the water stress to these trees, resulting in the decrease of sugar and citric acid content in fruits. Fruit quality was affected by the (high)(low) water potential value in the leaf (LWP) of -0.5MPa. The vertical fruit growth in the early stage during the period from flowering to early fruit growth was especially promoted by the gap of temperature between the daytime and nighttime. There was a cross correlation between the transverse diameter in time of thinning and the one in harvesting. The remaining fruit with transverse diameter of 40mm or more at thinning time enabled the fruit to be in the size of 2L or more at harvest. Fruit growth was promoted when the number of leaves per fruit was managed from 80 to 120. Considering the water stress to trees, in practice, however, the recommended fruit and leaf ratio would be 100 to 120. The restriction of irrigation to manipulate the water stress to trees might be needed to increase the fruit quality. The timing of fruit thinning should be about 50 days after full bloom to harvest large and good quality fruit.
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