| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥800,000 (Direct Cost: ¥800,000)
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| Research Abstract |
Relationship between fruit yield of a tree and its wood volume in pear major cultivars are surveyed in eleven orchards attached prefectural Agricultural Experiment Stations of major pear growing areas throughout Japan.
There are positive correlations among yield of a tree, volume of wood, diameter of trunk, cumulative length of branches more than 2 cm diameter in the same cultivar, therefore, more larger size of tree has produced higher fruit yield yield than that of smaller fruit tree. Contrally, there are negative correlations between yield efficiency, namely ratio of fruit yield per unit sectional area of trunk and its trunk diameter.
As new ideas around yield efficiency, there is a way of dry matter partitioning such as fruit productive coefficient (tentatively called, =Y/V+Y, Y;fruit yield of a tree, V;volume of wood) and fruit yield index (=y/at+y, at;sectional area of trunk). The linear regression between fruit productive coefficient and their volume of woods with using three major cultivars (Shinsui, Kousui and Housui) was shown as a standardized productivity in mature trees as follows: Y=58.84-0.076X,(Y;fruit productive coefficient, X;volume of wood in fresh weight basis).
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