Effects of various training systems on canopy development, yield and fruit quality in young filler trees of Japanese pear [Pyrus pyrifolia] "Gold Nijisseiki"
2006
Yoshida, A.(Tottori Univ. (Japan)) | Ikeda, T. | Murata, K. | Inoue, K.
To obtain early and high yield in the young filler trees of Japanese pear 'Gold Nijisseiki', the effects of different training systems on canopy development, yield, and fruit quality were investigated. Permanent trees with 3 scaffolds (PT) and filler trees with 6 different tree forms, that is, 3 scaffolds (3-SF), 4 scaffolds (4-SF), 6 scaffolds (6-SF), improved-two-branch 8 scaffolds (I-8-SF), 8 scaffolds (8-SF) and improved-two-branch 12 scaffolds (I-12-SF) were compared. The number of fruit and yield per tree increased earlier in the trees with larger numbers of scaffolds. The tendency was particularly pronounced for I-8-SF and I-12-SF. Cumulative yield of trees age 3 to 7 years was also higher for trees with larger numbers of scaffolds; the yield of I-12-SF surpassed that of PT by 76%. However, fruit quality was almost the same in the training systems. Highly positive correlations were observed between yield and some tree growth parameters, such as, total length of older wood, canopy area and LAI. These findings indicate that fruit yield strongly depends on the extension of older branches and consequent increase of canopy area or LAI. Therefore, training systems with a large number of scaffolds promote on increase in early fruit yield.
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