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Studies on the effect of fruit load on the composition of late maturing citrus trees i. effects of different leaf fruit ratios on the fruit quality and leaf element contents of kawano natsudaidai trees



Studies on the effect of fruit load on the composition of late maturing citrus trees i. effects of different leaf fruit ratios on the fruit quality and leaf element contents of kawano natsudaidai trees



Bulletin of the Fruit Tree Research Station Series D (Kuchinotsu) (9): 63-80



In order to clarify the relationship between fruit load and fruit quality or the leaf element contents of Kawano natsudaidai trees (Citrus natsudaidai Hayata), fruit on 16-year-old trees grown in an orchard were thinned in August or September, so that the leaf-fruit ratio was about 50 (increased fruiting), 100 (moderate fruiting) or 150 (reduced fruiting). The results obtained were as follows: 1. The fruit weight at harvest time increased when the fruit load was light, but fruit grew largest from August to November as a result of moderate fruiting. The flesh weight per fruit was increased by reduced fruiting, and the citric acid content in the juice was higher. The percentage of reducing sugar in the juice was higher as a result of increased fruiting. However, the juice weight per flesh, Brix value and coloring were not influenced by these fruit loads. 2. The carbohydrate content of the leaf was reduced by increased fruiting soon after the thinning treatment, but there was little difference in winter, and the increase occurring from inter to spring was greater with reduced fruiting. The nitrogen content of the leaf was highest with moderate fruiting. With moderate fruiting, and the carbohydrate-nitrogen ratio was reduced by increased fruiting. The total sugar content of the leaf sap of increased fruiting trees, which had decreased flower set the following spring, was higher between winter and the following summer. The percentage of reducing sugar in leaf sap wsa lowest with moderate fruiting, and higher in trees with less flower set between spring and summer. The calcium content in leaf sap was higher with increased fruiting. The magnesium content in leaf sap was reduced with increased fruiting in the first year, and this treatment decreased the flower set the following spring, whereas the magnesium content of the same tree showed a continuous decrease. The phosphorus content in the leaf was higher as a result of increased fruiting. The primary free amino acid content in the leaf was greater with increased fruiting. 3. The nitrogen, phosphorus, calcium and magnesium contents in fruit were higher with increased fruiting, and the potassium content was lowest as a result of moderate fruiting the following year. These differences were similar to those in the leaf.

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