Correlation between Different Type and Diameter of the Bearing Shoot and Fruit Weight of Loquat (Eriobotrya japonica (Thunb.) Lindl.)

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  • ビワ（Eriobotrya japonica（Thunb.）Lindl.）における結果枝の太さおよび種類と果実重との関係について
  • ビワ(Eriobotrya japonica (Thunb.) Lindl.)ニ オケル ケッカ シ ノ フトサ オヨビ シュルイ ト カジツジュウ ト ノ カンケイ ニ ツイテ

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This experiment was done to improve farm training education and to create the method to produce large fruits of loquat in Toso Orchard, Faculty of Agriculture, Kagoshima University. Using‘ Nagasakiwase’ (outdoor or greenhouse cultivation),‘ Natsutayori’ (outdoor or greenhouse cultivation) and Mogi (outdoor cultivation), we investigated the relationship between different type or diameter of bearing shoot and a fruit cluster weight or a fruit weight.‘ Natsutayori’ (outdoor cultivation) had the largest shoot diameter and the fruit size compared with those in the other cultivars and the other cultivation environment. The diameter of central shoots was larger than that of the lateral shoots in all cultivars and cultivation environment without ‘Natsutayori’ (outdoor cultivation). A fruit cluster weight and a fruit weight of central shoots in ‘Natsutayori’ (outdoor cultivation) and ‘Mogi’ were heavier than those of lateral shoot. On the other hand, a fruit cluster and a fruit weight in ‘Nagasakiwase’ (outdoor and greenhouse cultivation) were almost equal to those in the central shoot and the lateral shoot, or higher value in the lateral shoot. The diameter of bearing shoot and the fruit cluster weight of all cultivars were showed the significant correlations positivly. These correlation coefficients were generally higher in the lateral shoot than in the central shoot. In particular ‘Natsutayori’ (outdoor cultivation) showed a high correlation coefficient (r=0.72) than other cultivars. Correlation between bearing shoot diameter and a fruit weight was weaker than correlation between bearing shoot diameter and a fruit cluster weight. These results indicated that in order to produce large loquat fruits in Toso Orchard, it is suitable to cultivate‘ Natsutayori’ which bears to harvest the larger fruit in outdoor cultivation. These results will also contribute to improve farm training education.

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